Im doing this 3 more times and thats it but heres another 100

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal

What are some of the difficulties that the japanese face due to the islands' geography?