Environmentalism: As polls show belief in global warming is dropping, a new study suggests that dogs and cats, like people, are a plague upon the earth. They say people should have edible pets. Here, kitty, kitty. A new Pew Research Center study conducted Sept. 30-Oct. 4 says the number of Americans who think there's solid evidence the average temperature on earth has been getting warmer over the past few decades has plummeted from 71% in April 2008 to 57% today. Over the same period, there's been a comparable decline in the proportion of Americans who say global temperatures are rising...