Some crops，such as riceand wheat are harvested by cutting off the top of theplant.When farmers gather such crops，they leave the bottompart in the ground.This part is called stubble.Farmers need space toplant their next crops，sosome of them burn the stubble.Now，some countries wantto make a law that stops farmers from doing thissupporters of the law believeit's important.People's health will be protected .This is because when stubbleis burned，smoke containing harmful chemicals is released.It can travel long distances，so the law would benefit thehealth of both rural and urbanpopulations.There is another advantageto stopping stubble burning.The quality of soil on farms.The quality of soil on farmscan be maintained .There are small organism，such as bacteria，in the soilthat make crops grow moreeasily .When stubble is burned，theground becomes extremelyhot，which will not happenif stubble burning is banned.However，opponents of thelaw are worried.Removing stubble from fields can be very difficult.Without fire，farmers needto buy specialized mechanicalequipment often costs a lot .This equipment oftencosts a lot，so it's impossible for farmes toafford .この文について費用は何ですか?