A few data points:
Climate change: How do we know?
http://climate.nasa.gov/evidence/
Scientific consensus: Earth's climate is warming
http://climate.nasa.gov/scientific-consensus/
Empirical evidence that humans are causing global warming
https://www.skepticalscience.com/emp...al-warming.htm
Global Warming Science: The science is clear. Global warming is happening.
We are the primary cause.
Global Warming Science | Union of Concerned Scientists