What can't we just burn the big piles of trash at the dump?

That's what I say about these big oil spills. Dump some diesel or gasoline on it and set it on fire.

Problem solved.... no oil.

That causes worse pollution than garbage itself, you are literally saying that toxic gases are good for animals, us and plants.

Toxic fumes entering the fresh air.  A lot of towns have incinerators that burn the trash at really high degrees and then end up with ash.  This ash is then dumped to become nutrients for the soil.

a thing called air pollution thats why .

They tried that in the beginning. But much of the trash is plastics and stuff containing mercury and other chemicals.  That is a problem. No one can control the breeze.

There is TOXIC fumes that come from burning. Clean air is important.  If it is poisonous and the breeze blows it towards town then the people will feel it as they die like flies.THERE IS THAT.

. As the trash is separated, metal is always recyclable, so is glass, and the plastics are removed...it is to be reused too. then that leaves garden waste and food (which came from a garden) so that is all mixed with sawdust and sewage and allowed to ferment for a period of time(months)  The result is black soil fertilizer that can be taken out and used on lawns as their black loam.  You send the schit and they sell you processed schit next year...as topsoil.

. Controlled burns are good for the forests to prevent major forest fires...where much is lost. That is part of forest management. But we can not control lightning strikes and where they happen.

. Ergo the big fires.  Or those produced by man and a careless cigarette.

That's what I say about these big oil spills. Dump some diesel or gasoline on it and set it on fire.

Problem solved.... no oil.

it will spawn so serious environmental pollutions ,such as smog ,that city's visibility will be reduced ,

besides this  ,the terrible accidents may will happen ,the road ahead will be jammed with car so that many people is caught up in a traffic jam , if these problems occur ,who takes the responsiblity for that ? 

Burning piles of trash at the dump is a terrible idea. 

But a lot of trash is in fact, burned. It's called incineration, or waste-to-energy, and it's a common practice. However, the burning is done under controlled circumstances and there are pollution controls. Plus, the burning usually creates steam which runs power turbines to create electricity. (Even then, it's controversial, and some oppose incineration). 

Good. Let's site a new dump just upwind of your house.

That is what we used to do.  It spreads contamination across the region rather than keeping it in one place.  It is the lazy man way to deal with the problem, and it creates more problems that are even harder to deal with.  Sure, if burning actually destroyed everything and did not emit soot and gas intot he air, the idea would be great.  But open fires do emit lots of nasty carcinogenic gases and heavy metals and other poisons and toxics and sends them into the air to go wherever the wind blows.  Not very smart, at least not if your purpose is to get rid of the nasty stuff in wastes.