As this Nature Web focus explains, "just four countries account for 99% of the world's commercially grown transgenic crops," and other countries "have been stalling over whether to embrace transgenic agriculture, but won't be able to put off the decision for much longer." Readers can get an in-depth look at this issue with free features from Nature, including recent news articles, an interactive map of the world, and a link to Nature Reviews Genetics_ (also free of charge).