Climate change is real and mostly caused by human activities releasing greenhouse gases. It affects weather, health, and economies, especially hitting low-income and coastal communities hard. Efforts to reduce emissions and adapt to climate effects can still make a positive impact, even if too late to prevent some immediate climate problems. These actions could cost as little as 1% of global GDP annually, and the sooner we act, the cheaper it will be. The goal is to mitigate emissions and prepare for climate impacts through a mix of rules and incentives, which could protect future generations from irreversible harm.