Oil and coal account for 65-70 percent of our carbon emissions, followed by the carbon footprint of coal and steel, and these materials are among the most detrimental to the health of the planet, says Khosla Ventures founder Vinod Khosla. And too often, feel-good environmentalism gets in the way of truly solving the climate crisis. Khosla claims that most of what green-thinking activists do to try to help the environment is a mere gesture toward the planet, and that real solutions are going to require broader, more entrepreneurial, strokes of innovation.