Hi again Eon,
Nobody is a greater authority on the status of our planet than Nasa, National Geographic and NOAA. Here are their answers to your questions:
Quote:
Originally Posted by EonBlue
How long will it take?
What is the "natural" rate of warming for Earth? And how much are we speeding it up by?
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"average surface temperatures could rise between 2°C and 6°C by the end of the 21st century."
Global Warming : Feature Articles
Quote:
Originally Posted by EonBlue
What temperature is Earth supposed to be?
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"In Earth’s history before the Industrial Revolution, Earth’s climate changed due to natural causes not related to human activity. Most often, global climate has changed because of variations in sunlight......These natural causes are still in play today, but their influence is too small or they occur too slowly to explain the rapid warming seen in recent decades."
Global Warming : Feature Articles
Quote:
Originally Posted by EonBlue
How high or low is sea level supposed to be and what is the proper volume of ice at the poles?
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"Core samples, tide gauge readings, and, most recently, satellite measurements tell us that over the past century, the Global Mean Sea Level (GMSL) has risen by 4 to 8 inches (10 to 20 centimeters). However, the annual rate of rise over the past 20 years has been 0.13 inches (3.2 millimeters) a year, roughly twice the average speed of the preceding 80 years."
Sea Level Rise -- National Geographic
Quote:
Originally Posted by EonBlue
How much CO2 is too much?
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How Much Is Too Much?: Estimating Greenhouse Gas Emissions - Scientific American