claim: Some experts think we’re on track to hit 550 ppm by the end of the century, which would cause average global temperatures to rise by 6 degrees Celsius
evidence: A new statement, adopted by the society in 2003, revised in 2007, and revised and expanded in 2013, affirms that rising levels of greenhouse gases have caused and will continue to cause the global surface temperature to be warmer: Human activities are changing Earth's climate.