There is no empirical scientific evidence that proves man made CO2 is having any effect on the climate.

Question

This claim, featured on various blogs (e.g. the blog of well known climate change skeptic Joanne Nova or the 'Prepare for Change' group's website), and parroted by social media users and cites this report published by Dr. David Evans, which states "There is no actual evidence that carbon dioxide emissions are causing global warming."

Answer 1

Claim
Dr David Evans’ 2009 self-published essay states, “There is no actual evidence that carbon dioxide emissions are causing global warming.” (Content) The paper is a personal commentary, was not peer-reviewed, and presents no new measurements or experiments to back the statement.

What the evidence shows
Multiple independent lines of research contradict Evans’ claim. Laboratory studies have confirmed since the 1800s that CO₂ absorbs heat; modern satellites now watch this process in real time, documenting how extra CO₂ traps outgoing infrared energy and warms the planet. NASA’s “Vital Signs” database notes that human activity has driven atmospheric CO₂ up by about 50 percent in under two centuries and that this rise is warming Earth’s surface and oceans climate.nasa.gov. NOAA reaches the same conclusion, explaining that without the greenhouse effect of gases like CO₂, Earth would be far colder, and that today’s rapid CO₂ increase is “unequivocally” linked to human emissions research.noaa.gov. In short, the mainstream scientific record, grounded in direct measurements and not anecdotes, shows clear, consistent evidence that human-released CO₂ is a primary driver of modern global warming.