Between 5,000 and 8,000 years, methane emissions of both carbon dioxide and began presenting an upward trend.
It is likely that the accumulation of these greenhouse gases in the atmosphere over the last few thousand years has stopped the start of a new glacial cycle, as those who have been in constant intervals every 100,000 years during the last million years.
Each glacial period was marked by regular, predictable changes of Earth’s orbit, known as orbital variations.
Because of these variations in Earth’s orbit, although the solar luminosity is almost constant over millions of years, the average amount of radiation received by each hemisphere fluctuates, what times of extreme cold.
According to scientists, without the action of human beings today we would probably find one of those times.
