If you travel north through Koen Kahn, Korat, Chiang Mai, etc. you'll see huge areas of what looks like "scorched earth". If you look closer you will see local nationals actively burning their fields.
Every year they promise to enforce the no-burn laws yet each year the burning persists although they always are quick to point fingers at neighboring countries, vehicles, etc. It must be a customs thing or perhaps it's ingrained into them to burn their fields every year I don't know. I do know that this is human created and not much is being done to prevent it.
Folks nationwide are suffering from it and I would imagine it affects the economy and tourism greatly.