Nowadays, theexcess straw ofrom crops has become a big problem, and usually the only way to deal with them is usually burning. Nowadays, excess straw from crops has become a big problem, and usually the only way to deal with them is burning.

"Straw of crops" I can understand, but it does not indicate why the straw is causing a problem. If it is too much, you can say "excess straw from crops"

SoThus far, there is not a good better method yet. Thus far, there is no better method yet.

In the past, wheat straw could be fed to cattle, sweet potatoes straw and corn straw could be fed to pigs, the cotton straw and soybean straw could be used as firewood. In the past, wheat straw could be fed to cattle, sweet potato straw and corn straw could be fed to pigs, the cotton straw and soybean straw could be used as firewood.

Everything iwas so harmonious and natural. Everything was so harmonious and natural.

This sentence makes sense, but we don't really use the word "harmonious" to describe this kind of situation.

But now, farmers no longer breed livestock and they no longer cook in old cooking utensilswith firewood, so the crop straw can’t be used. But now, farmers no longer breed livestock and they no longer cook with firewood, so the crop straw can’t be used.

The dDevelopment will bringhas brought some problems and everything is dialectical (? I do not understand what you mean here), but the crop straw problem is not a big deal because various departments are focusing on it and have made great progress in how to use themcrop straw. Development has brought some problems and everything is dialectical (? I do not understand what you mean here), but the crop straw problem is not a big deal because various departments are focusing on it and have made great progress in how to use crop straw.