I think the solutions are all those things you have mentioned and many more like

. companies and factories should practicebetter waste disposal both liquid, gaseous and solid wastes.

. education and proper sensitization on the harm of all these to should be done. and so on

but let me tell you the best solution......

it's action....

if I come and talk, you come and also talk and so many people come and talk about all these and still none of us is practicalizing this, then we are all wasting our time.

let all work hand in hand and save our home earth.

no solution is better than we begin to work on those on ground trust me......