190 Countries Adopt Plan to Offset Jet Emissions The measure takes effect in 2021 and will for the first time reduce the climate impact of international jet travel. The first six years will be voluntary. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:UK to team up with NASA: Officials from both sides meet to discuss collaborationTake a Number: More Americans Are Dying of Cirrhosis and Liver CancerBefore Roe, New York Was America’s ‘Abortion Capital.’ Where Will Women Turn if Access Shrinks?Memory BOMBSHELL: Forget what you think you remember - your first memory was FICTIONALOverlooked No More: Beatrice Tinsley, Astronomer Who Saw the Course of the UniverseTrilobites: Don’t Squish the Jellyfish. Catch It With a Robotic Claw.