While it's true that many organisations are looking to reduce their carbon footprint, it's also the case that much of the green hype is unfounded. Besides, there's plenty of evidence that planting-a-tree missions are a misguided approach to reducing carbon emissions.
Friends of the Earth
Stop planting trees under the pretext of Marketing
Environmental Advocates Urge the EPA to Reduce Global Warming Pollution from Ships
Earthjustice, Oceana, Friends of the Earth, and the Center for Biological Diversity have joined forces in the fight to reduce global warming pollution from ships. Despite contributing to almost 3% of the world’s carbon dioxide, marine vessels’ emissions receive no regulation under the Kyoto Protocol. Their emissions include several global warming pollutants such as carbon dioxide, nitrous oxide, and black carbon. This coalition of environmental advocates filed a petition today with the U.S.

New nuclear row as green groups pull out
Greenpeace, Friends of the Earth and WWF pull out of government consultation on building new nuclear power stations in the UK describing the exercise as sham.