Show CO₂ for flights on trip list.

web_view.py

@@ -404,13 +404,17 @@ def calc_total_distance(trips: list[Trip]) -> float:
     """Total distance for trips."""
     total = 0.0
     for item in trips:
-        dist = item.total_distance()
-        if dist:
+        if dist := item.total_distance():
             total += dist
 
     return total
 
 
+def calc_total_co2_kg(trips: list[Trip]) -> float:
+    """Total CO₂ for trips."""
+    return sum(item.total_co2_kg() for item in trips)
+
+
 def sum_distances_by_transport_type(trips: list[Trip]) -> list[tuple[str, float]]:
     """Sum distances by transport type."""
     distances_by_transport_type: defaultdict[str, float] = defaultdict(float)
@@ -443,6 +447,7 @@ def trip_past_list() -> str:
         format_list_with_ampersand=format_list_with_ampersand,
         fx_rate=agenda.fx.get_rates(app.config),
         total_distance=calc_total_distance(past),
+        total_co2_kg=calc_total_co2_kg(past),
         distances_by_transport_type=sum_distances_by_transport_type(past),
     )
 
@@ -475,6 +480,7 @@ def trip_future_list() -> str:
         format_list_with_ampersand=format_list_with_ampersand,
         fx_rate=agenda.fx.get_rates(app.config),
         total_distance=calc_total_distance(current + future),
+        total_co2_kg=calc_total_co2_kg(current + future),
         distances_by_transport_type=sum_distances_by_transport_type(current + future),
     )