What is a Wedge?

A "wedge" is a strategy to reduce carbon emissions that grows in 50 years from zero to 1.0 GtC/yr. The strategy has already been commercialized at scale somewhere. Below the text there is a right triangle. The horizontal leg is labeled 50 yrs. The vertical leg is labeled 1GtC/yr and the area inside the triangle is labled Total = 25 Gigatons carbon.