Sentences with phrase «earth over tens of thousands of years»

Not exact matches

Processes that have historically altered the face of the planet, like cycles in the Earth's orbit around the Sun or shifts in continental tectonic plates, occur over tens of thousands to millions of years.

Then suddenly, in the last ten thousand years — a mere 0.4 % eye blink of time — our population increased over 1000 times, we decimated the earth's stocks of non-renewable resources, we cut down over 90 % of the planet's forests, we fished her oceans to the edge of extinction, and we live in a near - constant state of conflict with each other.

The postulated and very likely cause of the ice ages are variations of the earths orbit around the sun, and variations of the inclination of the earth's axis in relation to this orbit, which cause variations of the sun's heating of different parts of the earth at different times of the year (mainly the northern hemisphere) over long periods of time (tens of thousands of years).

Glacial cycles (ice ages) are set in motion by (1) periodic wobbles in the tilt of the Earth's rotation, (2) changes in the tilt of its axis, and (3) the shape of its orbit occurring over tens of thousands of years.

These scientists also mentioned the supposed «stability of the Earth's climate over the past ten thousand years».

They know that the highly regular ice ages are caused primarily not by CO2 increases and decreases in the atmosphere but by well known wobbles in the earth's rotation — over tens of thousands of years.

All these changes take place over tens of thousands of years, but they can change the amount of sunlight that the Earth gets in the Northern or Southern Hemisphere, and these changes in the distribution of the sun's heat are closely tied to the rise and fall of ice ages.

The earth spins on its axis on an ever changing wobble (over tens of thousands of years) back and forth, affecting the angle of sunlight striking the poles (by up to about eight degrees, I think) as the result.