Global climate change has already had observable effects on the environment.

Glaciers have shrunk, ice on river and lakes is breaking up earlier, plant and animals ranges have shifted and trees are flowering sooner

Effects that scientists had predicted in the past would result from global climate change are now occurring: loss of sea ice, accelerated sea level rise and longer, more intense heat waves.

Trees help cool the planet by sucking in and storing harmful greenhouse gases, like carbon dioxide, into their trunks, branches, and leaves, and releasing oxygen back into the atmosphere. In cities, trees can reduce overall temperature by up to eight degrees Celsius. With more than 50% of the world’s population living in cities—a number expected to increase to 66% by the year 2050—pollution and overheating are becoming a real threat. Fortunately, trees can absorb up to 150 kg of carbon dioxide per year, making cities a healthier, safer place to live.