In many cases, the "less fortunate" nation is primarily responsible for its own problems; look at desperately-poor North Korea for example, and compare it to neighboring South Korea. Same Korean people; same Natural Resources. NORK is totalitarian and starving, while the ROK is relatively free and very prosperous.
Or compare prosperous Rhodesia, the breadbasket of Africa, to the disaster that Robert Mugabe has created in Zimbabwe. Or East Germany compared to West Germany; same Germans, different political systems. It's the difference between a Trabant and a Mercedes.
Totalitarian political systems and communist economies can ruin ANY nation, no matter how much foreign aid they receive.
Governments, in conjunction with the United Nations.
Most nations have played some part in global warming and climate change. But, all nations with modern societies with automobiles and that use fossil fuel for heat or transportation contribute to climate change and are responsible for it to some degree. Whether they're responsible for it or not they'll suffer from it.
For some of them you can use "future super-powers" None pattern for undeveloped contries has been created yet. Suppose that there are 8 developed countries. The ninth one should be a developing country ? Assuming that all the developed countries have multiple issues not yet solved, there are none fully developed country today.
it shoud be meade more stringent in a phased manner for every countr to help eradicate poverty from poor nations and developing nations.
Since human resources are responsible for attracting talent, they are responsible for developing the company's culture. The company's culture should align with the strategic direction of the organization.
The following lectures by Hans Rosling should help you answer that for yourself http://www.ted.com/index.php/speakers/hans_rosling.html
test it
because they are stupid
Yes, "United Nations" should be capitalized because it is the official name of an organization.
Yes they should be responsible.
how should government be responsible for safe disposal?
YES. I ought to be responsible. You should be too.