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Climate change is one of the greatest environmental, social and economic threats facing our planet.

Scientific research has provided strong evidence for human-induced climate change through a variety of methods, and studies in all regions of the world continue to define the "spectrum of concern" about climate change and its current and future climate impacts. There is evidence that a variety of impacts are already attributable to climate change: changes in species behavior and lifecycle, rising sea levels, retreat of glaciers worldwide, and additional risks to human populations from heat-related impacts, to name a few. Impacts are expected to intensify and diversify as temperatures increase further.

Jackson Glacier

However, future projections of climate change and climate impacts are inherently uncertain, and often that uncertainty paralyzes decision making or is used as a reason to delay action. Uncertainty in forecasting of future conditions or events is an accepted aspect of a variety of political and financial decision making processes, and it should not prevent society from making policy decisions now to alter the trajectory of greenhouse gas emissions and climate change. Instead, we must recognize that, while there is uncertainty, we have enough information to begin to make educated guesses about how much we should reduce greenhouse gas emissions, and that the longer we delay, the more dangerous change becomes likely.