Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. Not all trees drop their leaves in the fall. Even in the height of winter ...

Spotting a few brown or dying leaves on your tree can be distressing. While it's probably not a reason to panic, it is a sign that you should take a closer look at your tree's health. A lot of ...

The basics of photosynthesis are something that every student learns in school: carbon dioxide, water and light in; oxygen and sugar for growth out. In a world where atmospheric carbon dioxide levels ...