Which best descrives why substinence farming was forced to evolve in the late 20th century? A. Increasingly extreme weather disrupted production
B. Output per person failed to increase
C. Yields were unable to meet demand
D. Leaving land fallow disrupted production
E. Growing and urbanizing populations needed to be fed

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.