How do we know that Global Warming is man made?

Question

Recently the scientific community "officially" determined that it was "almost certain" that global warming is man made. But with only 150 of data to compare it too, and only a 1 degree increase in the average temperature in 50 years, how do we know that global warming isn't just statistically allowable heat variations natural occurrence, or a result of a changing sun that we are now just learning about?

I understand the conceptual idea behind green house gases and don't need the theory spelled out, I just want to know how our scientists can be so certain that it is man made green house gases that are responsible?

Answer 1

It's pretty simple. We know CO2 is a greenhouse gas. We know adding more of it to the atmosphere will cause temperatures to increase, and we know humans have increased the amount of CO2 in the atmosphere by more than 30%.
Connect the dots.

Answer 2

global warming is man made

1800 - world population 900 million
1900 - 1.6 billion
2000 - 6 billion
2005 - 6.5 billion people

In Future Shock written ion 1970 - the author stated that of ALL the
people who had ever lived on the earth - one HALF were alive in 1970

Global Warming: The Cold, Hard Facts?
By Timothy Ball

Monday, February 5, 2007

Global Warming, as we think we know it, doesn't exist. And I am not the only one trying to make people open up their eyes and see the truth. But few listen, despite the fact that I was the first Canadian Ph.D. in Climatology and I have an extensive background in climatology, especially the reconstruction of past climates and the impact of climate change on human history and the human condition.“Few listen, even though I have a Ph.D, (Doctor of Science) from the University of London, England and was a climatology professor at the University of Winnipeg.” . For some reason (actually for many), the World is not listening. Here is why.


What would happen if tomorrow we were told that, after all, the Earth is flat? It would probably be the most important piece of news in the media and would generate a lot of debate. So why is it that when scientists who have studied the Global Warming phenomenon for years say that humans are not the cause nobody listens? Why does no one acknowledge that the Emperor has no clothes on?

there is more - but I don't have the room