Although I won't get into the climate change debate .... I will comment on the "overseas development" part ..

In my previous employment I traveled extensively in both Africa and India, as well as many other parts of the world.. but I'll stick with those 2 for now. They both recieve an enormous amount of "aid" money from the UK Government and Charities... who, for reasons known only to themselves .. deal with the distribution in totally different ways.
Charities usually have a focused target and a small team to reach that target. The Government, for some unknown reason, refuse to "dictate" how the money is ACTUALLY spent (it is asked for a specific project .. but no checks are made) as this would "impinge on the sovreignty of the nation" ('dangle berries' !)
Thus the governement money is spent on, for example ... an "infrastructure project" .. which is actually a 7 mile dual carriage way from the rulers palace to the airport .. no other access roads or anything ... 7 miles for 1 man ... but of course his "entourage" is a dozen vehicles.
In most of these countries there is no "middle class" at all .. there are the poor and the rich and the rich control the money and ensure they get the majority of it.
Pigs in troughs comes to mind.