are these ages affected by human activities?
Yes, there is considerable evidence that over the last 100–1000 years, the sharp increases in human activity, especially the burning of fossil fuels, has caused the parallel sharp and accelerating increase in atmospheric greenhouse gases which trap the sun's heat.
Ice age
There is considerable evidence that over the very recent period of the last 100–1000 years, the sharp increases in human activity, especially the burning of fossil fuels, has caused the parallel sharp and accelerating increase in atmospheric greenhouse gases which trap the sun's heat.
the climate of canada can best be described as __ UNANSWERABLE what is climate? It is the long-term average of weather, typically averaged over a period of 30 years. are there models to represent this ? Yes, these models use quantitative methods to simulate the interactions of the atmosphere, oceans, land surface and ice. is this changing? Yes, the Earth has undergone periodic climate shifts in the past, including four major ice ages. how can these ages be defined? This is a long period of reduction in the temperature of the Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. what were a few of these major ages? At least five major ones - the Huronian, Cryogenian, Andean-Saharan, late Paleozoic, and the latest Quaternary Ice Age
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Ice age [SEP] Human-induced changes
There is considerable evidence that over the very recent period of the last 100–1000 years, the sharp increases in human activity, especially the burning of fossil fuels, has caused the parallel sharp and accelerating increase in atmospheric greenhouse gases which trap the sun's heat. The consensus theory of the scientific community is that the resulting greenhouse effect is a principal cause of the increase in global warming which has occurred over the same period, and a chief contributor to the accelerated melting of the remaining glaciers and polar ice. A 2012 investigation finds that dinosaurs released methane through digestion in a similar amount to humanity's current methane release, which "could have been a key factor" to the very warm climate 150 million years ago.