The amount needed to manage protected areas such as national parks represents a fraction of what the world spends annually on defense, says a study author.
Pico do Fogo is a shield volcano in the Cape Verde islands, off Africa's west coast. After a 20-year quiet, it began erupting Sunday, causing hundreds to evacuate.
You might think a hummingbird simply beats its wings so fast and hard it pushes down enough air to keep its small body afloat. Turns out it's much trickier than that.