What Affects the Earth's Climate or ... Doomsday 2012 Is True?

What affects the Earth's climate or ... doomsday 2012 is true?

A lot of changes of the Earth surface (or our environment) occur now. All   media overwhelmed information about changes which happen in our days, everyday. Solar radiation, deviations in the Earth orbit, mountain-building and continental drift and greenhouse gas concentration - this is not a complete set of what is happening with our planet! All of that affect to the climate our habitat and changes occur now are very fast. Let see what going on the Earth!

Plate tectonics

Over the course of millions of years, the motion of tectonic plates reconfigures global land and ocean areas and generates topography.

The position of the continents determines the geometry of the oceans and therefore influences patterns of ocean circulation. The locations of the seas are important in controlling the transfer of heat and moisture across the globe.

Orbital variations
Slight variations (100s of miles) in Earth's orbit lead to changes in the seasonal distribution of sunlight reaching the Earth's surface and how it is distributed across the planet.   Types of orbital variations (changes in the tilt angle of Earth's axis of rotation, and precession of Earth's axis), have a large impact on climate.
Volcanism
Volcanic eruptions, geysers, and hot springs, are examples of volcanic processes.
Eruptions, large enough to affect climate occur on average several times per century, and cause cooling   for a period of a few years. The eruption of Mount Pinatubo in 1991, the second largest terrestrial eruption of the 20th century affected the climate substantially. Global temperatures decreased by about 0.5 °C (0.9 °F).
Volcanoes are also part of the extended carbon cycle. Over very long (geological) time periods, they release carbon dioxide from the Earth's crust and mantle.
Human influences
Anthropogenic factors - it is human activity affecting the environment changes. In some cases the chain of causality of human...