diff --git a/envs/environment.fixed.yaml b/envs/environment.fixed.yaml
index d625a5b1..ac2d7eee 100644
--- a/envs/environment.fixed.yaml
+++ b/envs/environment.fixed.yaml
@@ -1,6 +1,10 @@
+# SPDX-FileCopyrightText: : 2017-2024 The PyPSA-Eur Authors
+#
+# SPDX-License-Identifier: CC0-1.0
+
 name: pypsa-eur-20240812
 channels:
-  - http://conda.anaconda.org/gurobi
-  - conda-forge
-  - defaults
+- http://conda.anaconda.org/gurobi
+- conda-forge
+- defaults
 prefix: /home/fneum/miniconda3/envs/pypsa-eur-20240812
diff --git a/scripts/prepare_sector_network.py b/scripts/prepare_sector_network.py
index 5f579c5d..89175b1f 100644
--- a/scripts/prepare_sector_network.py
+++ b/scripts/prepare_sector_network.py
@@ -2377,12 +2377,9 @@ def add_biomass(n, costs):
             carrier="municipal solid waste",
         )
 
-        e_max_pu = np.array(
-            len(spatial.msw.nodes) * [[1] * (len(n.snapshots) - 1) + [0]]
-        ).T
-        e_max_pu = pd.DataFrame(
-            e_max_pu, index=n.snapshots, columns=spatial.msw.nodes
-        ).astype(float)
+        e_max_pu = pd.DataFrame(1, index=n.snapshots, columns=spatial.msw.nodes)
+        e_max_pu.iloc[-1] = 0
+
         n.madd(
             "Store",
             spatial.msw.nodes,
@@ -3383,9 +3380,13 @@ def add_industry(n, costs):
                 spatial.msw.locations,
                 bus0=spatial.msw.nodes,
                 bus1=non_sequestered_hvc_locations,
+                bus2="co2 atmosphere",
                 carrier="municipal solid waste",
                 p_nom_extendable=True,
                 efficiency=1.0,
+                efficiency2=-costs.at[
+                    "oil", "CO2 intensity"
+                ],  # because msw is co2 neutral and will be burned in waste CHP or decomposed as oil
             )
 
         n.madd(