Pros
It feels good to save the environment, job is adventurous at times and there are some great people.
Cons
It's an authoritarian organization, with almost only white guys in the command and it is not LGBT friendly. Greenpeace tries to replicate the very corporate model of work it pretends to fight, with a highly hierarchical organization and little room for democratic decisions. Managers pose like tough bosses, demeaning their employees. If something goes wrong, it will be your fault, not theirs. It also replicates an imperialistic model, with offices from developed countries deciding on what developing countries offices should do: after all, they pay most of the bill. Over the years I understood that Greenpeace is more concerned with raising money than saving the environment. All decisons are taken having fundraising in consideration. So, sometimes Greenpeace poses as a friend of indigenous groups and uses their images and problems to raise money. Then, the organization makes deals with corporations and tells their funders that the corporations "are doing the right thing". It's a Greenpeace victory! Immediately they move away and start targeting another corporation, while nothing changes.