Just as on smoking, voices now come from many quarters insisting that the science about global warming is incomplete, that it's OK to keep puring fumes into the air until we know for sure. This is dangerous game: by the time 100 percent of the evidence is in, it may be too late. With the risks abvious and growing, a prudent people would take out an insurance policy now.

100 percent of the evidence is in .     老师们，请问这里是省略吗？