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Posted by / 07-Mar-2017 20:22

Canadian new datings

With the current and growing global population, much of which is concentrated in coastal cities, such a rise in sea level would have a drastic effect on our complex society, especially if the climate were to change as suddenly as it has at times in the past. Increased CO2 in the atmosphere also increases CO2 levels in the oceans, making sea water slightly more acidic and less oxygenated.

Equally, it seems likely that as warming continues some areas may experience less precipitation leading to drought. In past warming events, such as at the Paleocene-Eocene Thermal Maximum (PETM) 55 million years ago, this caused marine crises and extinctions.

What I am not going to permit is social commentary and chit chat. What I am aiming for is to assemble information in one place that either supports or refutes the position of The Geological Society. Geologists have recently contributed to improved estimates of climate sensitivity (defined as the increase in global mean temperature resulting from a doubling in atmospheric CO2 levels).

With both rising seas and increasing drought, pressure for human migration could result on a large scale. M., 1990, High eustatic sea level during the Middle Pliocene: Evidence from the southeastern U. The Earth System usually takes around 100,000 years to recover from such events.

When and how did today’s climate become established? D., 2010, Alkenone and boron-based Pliocene p CO2 records. Given the above, based on a growing abundance of palaeoclimate data, there is now greater confidence than in 2010 that the only plausible explanation for the rate and extent of temperature increase since 1900 is the exponential rise in CO2 and other greenhouse gases in the atmosphere since the Industrial Revolution. Summerhayes (chairman), Scott Polar Research Institute; J.

The geological record contains abundant evidence of the ways in which Earth’s climate has changed in the past. C., Wood, A., Tsukagoshi, A., Ikeya, N., Brouwers, E. We are living through an interglacial period, whose mean temperature is representative of only 10% of the last 800,000 years.

That evidence is highly relevant to understanding how it may change in the future. The other 90% of that time, temperatures were lower, ice sheets larger and sea levels lower.

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