Protecting 17% of land mass would conserve 2/3rds of plant species. Now 13% are protected
"A Duke University led study of the data subsequently calculated that protecting 17 percent of the earth's landmass would preserve more than two-thirds of its plant species. Currently almost 13 percent of the Earth's land area is protected-although protection is limited in the key areas identified by the research, like Central America, the Caribbean, and sub-Saharan Africa."
"The Uncertain Future of Extinctions," Solutions (2013): 8.