claim: With marine ice cliff instability, sea-level rise for the next century is potentially much larger than we thought it might be five or 10 years ago
evidence: The average global temperature on Earth has increased by about 0.8° Celsius (1.4° Fahrenheit) since 1880; Two-thirds of the warming has occurred since 1975, at a rate of roughly 0.15-0.20 °C per decade.