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Secured their food
By radiation: mainly in the infrared wavelengths.
thermosphere
The Earth is warmed mainly by solar radiation. It is measured in kilowatt-hours per square meter per day. This is called incident solar radiation or insolation.
Air Conditioning
Secured their food
Secured their food
built their homes
secured their food
all the answers are correct
Secured their food
All the answers are correct. They made many glaciers that are yet to melt and the also lowered the temperature that we have today
The sun
themosphere
Climate change is a natural phenomenon. It has happened many times in earths past and will continue to do so.A:Climate change is the result of the global warming that has been happening, especially in the last forty years, when the earth has warmed more quickly than it has ever warmed before. Global warming is being caused by deforestation and the burning of fossil fuels (coal, oil and natural gas) in industry, transport and the generation of electricity, which releases carbon dioxide (CO2).
It is warmed by geothermal energy which is created by RADIOACTIVE DECAY http://en.wikipedia.org/wiki/Geothermal_(geology)
"The earth is warmed by the sun through radiation"