In the US, its transport, because people drive cars and sit in traffic so much.

The rest of the world its 2nd or 3rd behind power generation and food.

Working from home is probably the next best thing.

Also, changes in diet does not necessarily mean changing what you eat. A huge amount on gains are to be had, just changing where where your food comes from. Local small producers are the gold standard. Combine that with growing some of your own vegtibles.

Why would a sicko denegrate himself like that?

Anti-Jesus fish uncertainty centrifuge.