If you have an adequately sized ranged for your stove then it'll suck up whatever noxious gases are emitted and not burned. It's also not that difficult to test on your own.
Additionally, the main impacts on climate change from natural gas don't come from peoples homes or lateral lines, which is what a lot of these bans are based on. [1] [2]
A range hood can suck out a lot of a room’s warm air. That could change the efficiency of gas cooking, depending on circumstances and climate. Do heat exchangers exist on range hoods?
I don't think so, you just have a flap that absent a pressure gradient stays closed. When extraction is on, you usually are producing heat so it's not as big of a deal.
I don't think that's the case. The flame applied to the bottom of the vessel is where heat goes. Anything you feel outside of that is technically wasted.
Additionally, the main impacts on climate change from natural gas don't come from peoples homes or lateral lines, which is what a lot of these bans are based on. [1] [2]
1: https://www.eia.gov/energyexplained/natural-gas/natural-gas-...
2: https://www.eia.gov/totalenergy/data/monthly/pdf/flow/CO2-sp...