diff --git a/dev/numpy/demand_array.pkl b/dev/numpy/demand_array.pkl
new file mode 100644
index 0000000..7a89872
Binary files /dev/null and b/dev/numpy/demand_array.pkl differ
diff --git a/dev/numpy/environment.yaml b/dev/numpy/environment.yaml
new file mode 100644
index 0000000..89360ce
--- /dev/null
+++ b/dev/numpy/environment.yaml
@@ -0,0 +1,10 @@
+name: numpy
+channels:
+  - conda-forge
+  - nodefaults
+dependencies:
+  - python=3.12
+  - pandas=2.2.2 # https://anaconda.org/conda-forge/pandas/files
+  - scipy=1.13.1 # https://anaconda.org/conda-forge/scipy/files
+  - numpy=2.0.0 # https://anaconda.org/conda-forge/numpy/files
+  - jupyterlab
\ No newline at end of file
diff --git a/dev/numpy/numpy_2_apple_silicon.ipynb b/dev/numpy/numpy_2_apple_silicon.ipynb
new file mode 100644
index 0000000..f79a94d
--- /dev/null
+++ b/dev/numpy/numpy_2_apple_silicon.ipynb
@@ -0,0 +1,538 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import numpy as np"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Build Dependencies:\n",
+      "  blas:\n",
+      "    detection method: pkgconfig\n",
+      "    found: true\n",
+      "    include directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/include\n",
+      "    lib directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/lib\n",
+      "    name: blas\n",
+      "    openblas configuration: unknown\n",
+      "    pc file directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/lib/pkgconfig\n",
+      "    version: 3.9.0\n",
+      "  lapack:\n",
+      "    detection method: internal\n",
+      "    found: true\n",
+      "    include directory: unknown\n",
+      "    lib directory: unknown\n",
+      "    name: dep4377784592\n",
+      "    openblas configuration: unknown\n",
+      "    pc file directory: unknown\n",
+      "    version: 1.26.4\n",
+      "Compilers:\n",
+      "  c:\n",
+      "    args: -ftree-vectorize, -fPIC, -fstack-protector-strong, -O2, -pipe, -isystem,\n",
+      "      /opt/homebrew/Caskroom/miniconda/base/envs/main/include, -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/numpy_1707225640867/work=/usr/local/src/conda/numpy-1.26.4,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    commands: arm64-apple-darwin20.0.0-clang\n",
+      "    linker: ld64\n",
+      "    linker args: -Wl,-headerpad_max_install_names, -Wl,-dead_strip_dylibs, -Wl,-rpath,/opt/homebrew/Caskroom/miniconda/base/envs/main/lib,\n",
+      "      -L/opt/homebrew/Caskroom/miniconda/base/envs/main/lib, -ftree-vectorize, -fPIC,\n",
+      "      -fstack-protector-strong, -O2, -pipe, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/numpy_1707225640867/work=/usr/local/src/conda/numpy-1.26.4,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    name: clang\n",
+      "    version: 16.0.6\n",
+      "  c++:\n",
+      "    args: -ftree-vectorize, -fPIC, -fstack-protector-strong, -O2, -pipe, -stdlib=libc++,\n",
+      "      -fvisibility-inlines-hidden, -fmessage-length=0, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/numpy_1707225640867/work=/usr/local/src/conda/numpy-1.26.4,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    commands: arm64-apple-darwin20.0.0-clang++\n",
+      "    linker: ld64\n",
+      "    linker args: -Wl,-headerpad_max_install_names, -Wl,-dead_strip_dylibs, -Wl,-rpath,/opt/homebrew/Caskroom/miniconda/base/envs/main/lib,\n",
+      "      -L/opt/homebrew/Caskroom/miniconda/base/envs/main/lib, -ftree-vectorize, -fPIC,\n",
+      "      -fstack-protector-strong, -O2, -pipe, -stdlib=libc++, -fvisibility-inlines-hidden,\n",
+      "      -fmessage-length=0, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/numpy_1707225640867/work=/usr/local/src/conda/numpy-1.26.4,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    name: clang\n",
+      "    version: 16.0.6\n",
+      "  cython:\n",
+      "    commands: cython\n",
+      "    linker: cython\n",
+      "    name: cython\n",
+      "    version: 3.0.8\n",
+      "Machine Information:\n",
+      "  build:\n",
+      "    cpu: aarch64\n",
+      "    endian: little\n",
+      "    family: aarch64\n",
+      "    system: darwin\n",
+      "  cross-compiled: true\n",
+      "  host:\n",
+      "    cpu: arm64\n",
+      "    endian: little\n",
+      "    family: aarch64\n",
+      "    system: darwin\n",
+      "Python Information:\n",
+      "  path: /opt/homebrew/Caskroom/miniconda/base/envs/main/bin/python\n",
+      "  version: '3.11'\n",
+      "SIMD Extensions:\n",
+      "  baseline:\n",
+      "  - NEON\n",
+      "  - NEON_FP16\n",
+      "  - NEON_VFPV4\n",
+      "  - ASIMD\n",
+      "  found:\n",
+      "  - ASIMDHP\n",
+      "  not found:\n",
+      "  - ASIMDFHM\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "np.show_config()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import scipy as sp"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Build Dependencies:\n",
+      "  blas:\n",
+      "    detection method: pkgconfig\n",
+      "    found: true\n",
+      "    include directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/include\n",
+      "    lib directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/lib\n",
+      "    name: blas\n",
+      "    openblas configuration: unknown\n",
+      "    pc file directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/lib/pkgconfig\n",
+      "    version: 3.9.0\n",
+      "  lapack:\n",
+      "    detection method: pkgconfig\n",
+      "    found: true\n",
+      "    include directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/include\n",
+      "    lib directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/lib\n",
+      "    name: lapack\n",
+      "    openblas configuration: unknown\n",
+      "    pc file directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/lib/pkgconfig\n",
+      "    version: 3.9.0\n",
+      "  pybind11:\n",
+      "    detection method: pkgconfig\n",
+      "    include directory: /opt/homebrew/Caskroom/miniconda/base/envs/main/include\n",
+      "    name: pybind11\n",
+      "    version: 2.11.1\n",
+      "Compilers:\n",
+      "  c:\n",
+      "    args: -ftree-vectorize, -fPIC, -fstack-protector-strong, -O2, -pipe, -isystem,\n",
+      "      /opt/homebrew/Caskroom/miniconda/base/envs/main/include, -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/work=/usr/local/src/conda/scipy-split-1.12.0,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    commands: arm64-apple-darwin20.0.0-clang\n",
+      "    linker: ld64\n",
+      "    linker args: -Wl,-headerpad_max_install_names, -Wl,-dead_strip_dylibs, -Wl,-rpath,/opt/homebrew/Caskroom/miniconda/base/envs/main/lib,\n",
+      "      -L/opt/homebrew/Caskroom/miniconda/base/envs/main/lib, -ftree-vectorize, -fPIC,\n",
+      "      -fstack-protector-strong, -O2, -pipe, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/work=/usr/local/src/conda/scipy-split-1.12.0,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    name: clang\n",
+      "    version: 16.0.6\n",
+      "  c++:\n",
+      "    args: -ftree-vectorize, -fPIC, -fstack-protector-strong, -O2, -pipe, -stdlib=libc++,\n",
+      "      -fvisibility-inlines-hidden, -fmessage-length=0, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/work=/usr/local/src/conda/scipy-split-1.12.0,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    commands: arm64-apple-darwin20.0.0-clang++\n",
+      "    linker: ld64\n",
+      "    linker args: -Wl,-headerpad_max_install_names, -Wl,-dead_strip_dylibs, -Wl,-rpath,/opt/homebrew/Caskroom/miniconda/base/envs/main/lib,\n",
+      "      -L/opt/homebrew/Caskroom/miniconda/base/envs/main/lib, -ftree-vectorize, -fPIC,\n",
+      "      -fstack-protector-strong, -O2, -pipe, -stdlib=libc++, -fvisibility-inlines-hidden,\n",
+      "      -fmessage-length=0, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/work=/usr/local/src/conda/scipy-split-1.12.0,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix,\n",
+      "      -D_FORTIFY_SOURCE=2, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -mmacosx-version-min=11.0\n",
+      "    name: clang\n",
+      "    version: 16.0.6\n",
+      "  cython:\n",
+      "    commands: cython\n",
+      "    linker: cython\n",
+      "    name: cython\n",
+      "    version: 3.0.7\n",
+      "  fortran:\n",
+      "    args: -march=armv8.3-a, -ftree-vectorize, -fPIC, -fno-stack-protector, -O2, -pipe,\n",
+      "      -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include, -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/work=/usr/local/src/conda/scipy-split-1.12.0,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix\n",
+      "    commands: /Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/_build_env/bin/arm64-apple-darwin20.0.0-gfortran\n",
+      "    linker: ld64\n",
+      "    linker args: -Wl,-headerpad_max_install_names, -Wl,-dead_strip_dylibs, -Wl,-rpath,/opt/homebrew/Caskroom/miniconda/base/envs/main/lib,\n",
+      "      -L/opt/homebrew/Caskroom/miniconda/base/envs/main/lib, -march=armv8.3-a, -ftree-vectorize,\n",
+      "      -fPIC, -fno-stack-protector, -O2, -pipe, -isystem, /opt/homebrew/Caskroom/miniconda/base/envs/main/include,\n",
+      "      -fdebug-prefix-map=/Users/runner/miniforge3/conda-bld/scipy-split_1706041548403/work=/usr/local/src/conda/scipy-split-1.12.0,\n",
+      "      -fdebug-prefix-map=/opt/homebrew/Caskroom/miniconda/base/envs/main=/usr/local/src/conda-prefix\n",
+      "    name: gcc\n",
+      "    version: 12.3.0\n",
+      "  pythran:\n",
+      "    include directory: ../../_build_env/venv/lib/python3.11/site-packages/pythran\n",
+      "    version: 0.15.0\n",
+      "Machine Information:\n",
+      "  build:\n",
+      "    cpu: x86_64\n",
+      "    endian: little\n",
+      "    family: x86_64\n",
+      "    system: darwin\n",
+      "  cross-compiled: true\n",
+      "  host:\n",
+      "    cpu: arm64\n",
+      "    endian: little\n",
+      "    family: aarch64\n",
+      "    system: darwin\n",
+      "Python Information:\n",
+      "  path: /opt/homebrew/Caskroom/miniconda/base/envs/main/bin/python\n",
+      "  version: '3.11'\n",
+      "\n"
+     ]
+    }
+   ],
+   "source": [
+    "sp.show_config()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import bw2io as bi\n",
+    "import bw2data as bd\n",
+    "import bw2calc as bc"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'0.9.DEV27'"
+      ]
+     },
+     "execution_count": 2,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bi.__version__"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'2.0.DEV16'"
+      ]
+     },
+     "execution_count": 3,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bc.__version__"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "Databases dictionary with 4 object(s):\n",
+       "\tbiosphere3\n",
+       "\tecoinvent-3.10-apos\n",
+       "\tecoinvent-3.10-biosphere\n",
+       "\ttest"
+      ]
+     },
+     "execution_count": 7,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bd.databases"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "bd.projects.set_current(\"ei_3.10\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 10,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "ei = bd.Database(\"ecoinvent-3.10-apos\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 11,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "Methods dictionary with 668 objects, including:\n",
+       "\t('CML v4.8 2016', 'acidification', 'acidification (incl. fate, average Europe total, A&B)')\n",
+       "\t('CML v4.8 2016', 'climate change', 'global warming potential (GWP100)')\n",
+       "\t('CML v4.8 2016', 'ecotoxicity: freshwater', 'freshwater aquatic ecotoxicity (FAETP inf)')\n",
+       "\t('CML v4.8 2016', 'ecotoxicity: marine', 'marine aquatic ecotoxicity (MAETP inf)')\n",
+       "\t('CML v4.8 2016', 'ecotoxicity: terrestrial', 'terrestrial ecotoxicity (TETP inf)')\n",
+       "\t('CML v4.8 2016', 'energy resources: non-renewable', 'abiotic depletion potential (ADP): fossil fuels')\n",
+       "\t('CML v4.8 2016', 'eutrophication', 'eutrophication (fate not incl.)')\n",
+       "\t('CML v4.8 2016', 'human toxicity', 'human toxicity (HTP inf)')\n",
+       "\t('CML v4.8 2016', 'material resources: metals/minerals', 'abiotic depletion potential (ADP): elements (ultimate reserves)')\n",
+       "\t('CML v4.8 2016', 'ozone depletion', 'ozone layer depletion (ODP steady state)')\n",
+       "Use `list(this object)` to get the complete list."
+      ]
+     },
+     "execution_count": 11,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "bd.methods"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 17,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "lca = bc.LCA(\n",
+    "    demand={ei.random(): 1},\n",
+    "    method=('IPCC 2021', 'climate change', 'global warming potential (GWP100)')\n",
+    ")\n",
+    "lca.load_lci_data()\n",
+    "lca.build_demand_array()\n",
+    "    "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import pickle"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 23,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "pickle.dump(\n",
+    "    obj=lca.technosphere_matrix,\n",
+    "    file=open(\"technosphere_matrix.pkl\", \"wb\")\n",
+    ")\n",
+    "pickle.dump(\n",
+    "    obj=lca.demand_array,\n",
+    "    file=open(\"demand_array.pkl\", \"wb\")\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "technosphere_matrix = pickle.load(open(\"technosphere_matrix.pkl\", \"rb\"))\n",
+    "demand_array = pickle.load(open(\"demand_array.pkl\", \"rb\"))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "4.97 s ± 32.9 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)\n"
+     ]
+    }
+   ],
+   "source": [
+    "%%timeit\n",
+    "supply_array = sp.sparse.linalg.spsolve(technosphere_matrix, demand_array)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 8,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "14.5 s ± 161 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)\n"
+     ]
+    }
+   ],
+   "source": [
+    "%%timeit\n",
+    "supply_array = sp.sparse.linalg.spsolve(technosphere_matrix, demand_array, use_umfpack=True)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "14.4 s ± 245 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)\n"
+     ]
+    }
+   ],
+   "source": [
+    "%%timeit\n",
+    "supply_array = sp.sparse.linalg.spsolve(technosphere_matrix, demand_array, use_umfpack=False)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "ModuleNotFoundError",
+     "evalue": "No module named 'scikit_umfpack'",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mModuleNotFoundError\u001b[0m                       Traceback (most recent call last)",
+      "Cell \u001b[0;32mIn[12], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[38;5;28;01mimport\u001b[39;00m \u001b[38;5;21;01mscikit_umfpack\u001b[39;00m\n",
+      "\u001b[0;31mModuleNotFoundError\u001b[0m: No module named 'scikit_umfpack'"
+     ]
+    }
+   ],
+   "source": [
+    "import scikit_umfpack"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 13,
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "ImportError",
+     "evalue": "cannot import name 'Tester' from 'numpy.testing' (/opt/homebrew/Caskroom/miniconda/base/envs/main/lib/python3.11/site-packages/numpy/testing/__init__.py)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mImportError\u001b[0m                               Traceback (most recent call last)",
+      "Cell \u001b[0;32mIn[13], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m \u001b[38;5;28;01mfrom\u001b[39;00m \u001b[38;5;21;01mscikits\u001b[39;00m \u001b[38;5;28;01mimport\u001b[39;00m umfpack\n",
+      "File \u001b[0;32m/opt/homebrew/Caskroom/miniconda/base/envs/main/lib/python3.11/site-packages/scikits/umfpack/__init__.py:25\u001b[0m\n\u001b[1;32m     22\u001b[0m     \u001b[38;5;28;01mdel\u001b[39;00m _umfpack_doc, _interface_doc\n\u001b[1;32m     24\u001b[0m __all__ \u001b[38;5;241m=\u001b[39m [s \u001b[38;5;28;01mfor\u001b[39;00m s \u001b[38;5;129;01min\u001b[39;00m \u001b[38;5;28mdir\u001b[39m() \u001b[38;5;28;01mif\u001b[39;00m \u001b[38;5;129;01mnot\u001b[39;00m s\u001b[38;5;241m.\u001b[39mstartswith(\u001b[38;5;124m'\u001b[39m\u001b[38;5;124m_\u001b[39m\u001b[38;5;124m'\u001b[39m)]\n\u001b[0;32m---> 25\u001b[0m \u001b[38;5;28;01mfrom\u001b[39;00m \u001b[38;5;21;01mnumpy\u001b[39;00m\u001b[38;5;21;01m.\u001b[39;00m\u001b[38;5;21;01mtesting\u001b[39;00m \u001b[38;5;28;01mimport\u001b[39;00m Tester\n\u001b[1;32m     26\u001b[0m test \u001b[38;5;241m=\u001b[39m Tester()\u001b[38;5;241m.\u001b[39mtest\n",
+      "\u001b[0;31mImportError\u001b[0m: cannot import name 'Tester' from 'numpy.testing' (/opt/homebrew/Caskroom/miniconda/base/envs/main/lib/python3.11/site-packages/numpy/testing/__init__.py)"
+     ]
+    }
+   ],
+   "source": [
+    "from scikits import umfpack"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "numpy",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.8"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}
diff --git a/dev/numpy/technosphere_matrix.pkl b/dev/numpy/technosphere_matrix.pkl
new file mode 100644
index 0000000..6ca2cf3
Binary files /dev/null and b/dev/numpy/technosphere_matrix.pkl differ
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ce0035e
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+numpy==2.0.0
+scipy==1.14.0
+pandas==2.2.2
+#bw2data==4.0.dev43
+#bw2io==0.9.dev28
+#bw2calc==2.0.dev17
\ No newline at end of file