Here are some paragraphs from NASA-GISS research... NASA is government funded... They don't have much interest on political outcomes of their research... The source is at the end of the post if you'd like to read the full version...
What do you have to say now?
"The notion that humans could override nature and force the globe to warm intrigued Hansen.
"It had been known for more than a century that increasing carbon dioxide could have an effect on global temperature," Hansen said (referring to the pioneering work of John Tyndall and Svante Arrhenius in the 1800s). "
"
The model demonstrated that both human and natural activities could force climate to change. But Hansen knew that natural forcings, like
volcanic eruptions or changes in the Sun's activity, tend to go up and down over a long period of time whereas the human forcing from greenhouse gas emissions was steadily increasing."
"To questions about whether this warming is natural or just a fluctuation, the answer has become clear:
the world is getting warmer," Hansen stated. "This fact agrees so well with what we calculate with our global climate model that
I am confident we are looking at warming that is mainly due to increasing human-made greenhouse gases."
"Hansen's team
"cleans" the weather station data by finding and filtering out flawed data entries. Specifically, they apply a computer algorithm that checks each data point for temperature readings that are very significantly higher or lower than average for a given location at that time of year. Whenever such an anomaly is flagged, the algorithm compares those data to data from nearby stations to see if they show a similar anomaly. If so, then the data in question are kept; if not, or if there are no nearby stations for comparison, then the data are thrown away."
"For much of the twentieth century, both types of human emissions were on nearly equal footing, and aerosols were able to compete with greenhouse gases," Hansen said. But that balance has tilted increasingly in favor of greenhouse gases in the last 30 years. Today, Hansen's team estimates the human forcing from greenhouse gases to be about 3 watts per square meter (warming) and the forcing from aerosols to be about minus 1.5 watts per square meter (cooling). Hansen sees these trends as very likely to lead to what he calls "
dangerous human interference" with the climate system."
"
I think action [to reduce greenhouse gas emissions] is needed urgently, because we are on the precipice of a climate system 'tipping point'," Hansen concluded. "
I believe the evidence shows with reasonable clarity that the level of additional global warming that would put us into dangerous territory is at most 1°C."
"
If we follow a 'business-as-usual' course, Hansen predicts, then at the end of the twenty-first century we will find a planet that is 2-3°C warmer than today, which is a temperature Earth hasn't experienced since the middle Pliocene Epoch about three million years ago, when sea level was roughly 25 meters higher than it is today."
Source:
http://www.giss.nasa.gov/research/features/temptracker/