33–40In gardens and forests around the world, there is more and more evidence that the earth’s atmosphere is warming up. In North America, many species of birds which (33) to fly south for the cold winter months are staying in the north (34) .. A study of 77 gardens in Europe (35) that flowers are blooming earlier and leaves are falling(36) . In other words, as the atmosphere has gotten warmer, the growing season forvegetation has become a little bit longer each year. On the European continent, summer is(37) eleven days longer than it was forty years ago.The 1990s were the warmest decade of the twentieth century, and the changes in air temperatures (38) ocean temperatures as well. Greenland’s ice sheet has been(39) rapidly, and high ocean temperatures are also damaging the coral reefs. (40) , there is no evidence that global warming is either slowing down or coming to an end.