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"The climate was becoming cooler and drier, and seasonal, similar to modern climate.
The global average temperature in the mid-Pliocene (3.3 mya - 3 mya) was 2-3°C higher than today, global sea level 25 m higher  and Northern
hemisphere ice sheet ephemeral before the onset of extensive glaciation over Greenland that occurred in the late Pliocene around 3 Ma. The
formation of an Arctic ice cap is signaled by an abrupt shift in oxygen isotope ratios and ice-rafted cobbles in the North Atlantic and North Pacific
ocean beds. Mid-latitude glaciation was probably underway before the end of the epoch. The global cooling that occurred during the Pliocene may
have spurred on the disappearance of forests and the spread of grasslands and savannas.
Continents continued to drift, moving from positions possibly as far as 250 km from their present locations to positions only 70 km from their current
locations. South America became linked to North America through the Isthmus of Panama during the Pliocene, making possible the Great American
Interchange and bringing a nearly complete end to South America's distinctive large marsupial predator and native ungulate faunas. The formation of
the Isthmus had major consequences on global temperatures, since warm equatorial ocean currents were cut off and an Atlantic cooling cycle began, with
cold Arctic and Antarctic waters dropping temperatures in the now-isolated Atlantic Ocean.
Africa's collision with Europe formed the Mediterranean Sea, cutting off the remnants of the Tethys Ocean. The border between the Miocene and the
Pliocene is also the time of the Messinian salinity crisis. Sea level changes exposed the land-bridge between Alaska and Asia. Pliocene marine rocks
are well exposed in the Mediterranean, India, and China. Elsewhere, they are exposed largely near shores.
The change to a cooler, dry, seasonal climate had considerable impacts on Pliocene vegetation, reducing tropical species worldwide. Deciduous forests
proliferated, coniferous forests and tundra covered much of the north, and grasslands spread on all continents (except Antarctica). Tropical forests
were limited to a tight band around the equator, and in addition to dry savannahs, deserts appeared in Asia and Africa.
Both marine and continental faunas were essentially modern, although continental faunas were a bit more primitive than today. The first recognizable
hominins, the australopithecines, appeared in the Pliocene.
The land mass collisions meant great migration and mixing of previously isolated species, such as in the Great American Interchange. Herbivores got
bigger, as did specialized predators."
More here: Pliocene
Around 2.7 million years ago, our proto-ancestors had established a way of relating to everything. They ran with a trajectory towards a destination.
Each footstep had a trajectory and left a footprint. The system of ecosystems contained a niche for the diversifying old ones to relate to through a
modeling sense. That is how, with each step, we survive.
Our proto-ancestors read the natural mechanisms; they ran to run like the other species. Our proto-ancestors shared the natural mechanisms; they ran
together with planned trajectories. Our proto-ancestors pulled apart the natural mechanisms; they ran together but many trajectories were projected
towards many destinations. Our proto-ancestors reconfigured the natural mechanisms; they ran together into the imagination and stood up to train
themselves by utilizing the natural mechanisms we have conceptualized into “law” that every change in the form and the function of a bone or in
the function of the bone alone, leads to changes in its internal architecture and in its external form.
Sometimes it almost seems like human's destiny as a species is to destroy the earth and all other animals. How and why would evolution create a
species that was destined to destroy the system on which all life thrives? It seems pretty counterproductive.
Are our destinies contained within the atmosphere of the earth? If all of us share the thing we walk on, does that type of relationship mean that
other species and earth have a destiny as well?
What does the process of evolution involve? Could we be observing the destructive side of evolution? Are we that destructive side? But what is
destruction really? How is it possible that we may become the constructive side of evolution?
edit on 9-2-2012 by voicefromtheages because: added text