3 pieces of evidence or facts that seem to support concerns or worries about global warming?

Answer 1

1. Present CO2 levels 30% greater, methane 130% greater, rate of CO2 increase 200 TIMES (20000%) greater than seen at any time over the last 650,000 years.
(http://news.bbc.co.uk/1/hi/sci/tech/4467420.stm ). This coupled with the strong correlation between CO2 and ave global temp and the fact that temp lags behind CO2 means what we've already set in place will continue for many, many years to come.

2. Rising sea levels due to ice melt and thermal expansion of water.

3. Increasing proportion of tropical cyclones in the most powerful and destructive categories.

4. The Alaskan permafrost is thawing. Natives are having to leave their homes.

5. The Gore movie talks about over a thousand heat deaths in India when the temp went over 122 (F) in 2003 when the monsoon was delayed, but I have no idea if this is unusual. Also in 2003, there were 35,000 heat deaths across Europe with the hottest August on record. Although this is evidence that SEEMS to support GW concern, it can't really be attributed to GW for certain without a statistical analysis which I don't think is possible without more information.

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Although not exactly about warming, but related is that incresed CO2 is making ocean surface waters more acidic and making it harder for marine animals to form shells. This has led to shrinkage of coral reefs.

Answer 2

There are no facts, but in the other direction there are the Vostok Antarctic ice core studies that prove beyond a shadow of a doubt that the earth experiences cyclic periods of warming and cooling accompanied by attending atmospheric Co2 increases and decreases, also coincident with Milankovitch Earth orbit changes on 120,000 year cycles, and we are near a high peak right now. The real fact (proof) would be what percentage of this natural Co2/temp upswing is due to mans contribution? The new Russian government and their atmospheric scientists say (officially) very little.

Answer 3

Rise in CO2 levels in the atmosphere over the last 150 years.
Recent measurement of average average temperature increases
Shrinking glaciers and ice caps
Global warming of Venus due to high CO2 atmosphere
Historic tracking of earths atmospheric CO2 and temperature.

Answer 4

Climate change with associated drought (e.g. Australia) flooding (e.g. India).
Rising sea levels due to melting of the ice caps.
Increase in the size of the hole in the ozone layer.

On the other hand you have to realise that such changes have happened in the geological past and that those we are seeing right now may have nothing to do with man's abuse of our world resources. It is however sensible to change the way we could be accelerating changes as the survival of mankind may be at stake.

Answer 5

Since any ''evidence'' would be based on the 150 years of data available, it can hardly be considered valid. That's not even a fraction of the blink of an eye in Earth's history!