Global warming is caused by human activities like burning fossil fuels that increase greenhouse gas emissions, trapping heat in the atmosphere and increasing Earth's temperatures. This can impact human health by changing disease patterns and severity. While global warming occurs naturally, human activities are accelerating the process and causing problems like more extreme weather, rising sea levels, and ocean acidification that threaten coastal communities and marine life. Addressing global warming requires reducing greenhouse gas emissions through alternatives to fossil fuels and more sustainable practices.