ABCNews -- In the past five years, there's been an explosion of products marketed as "green" and good for the environment. And last year, Americans spent a great deal of money on them. But now, the government has cracked down on some companies, saying their green claims aren't accurate. Critics call the marketing practice "greenwashing" -- a way to attract customers by labeling products as eco-friendly when they may not be. The problem is that there is no legal definition of what "green" is, so companies can make all sorts of claims without providing proof. "Environmentally- friendly," "green" and "natural" are all labels with no legal meaning. "It infuriates me," said Leigh Stringer, an environmental architect, a mother and author of "The Green...