Pros
WRI is full of passionate, driven, incredibly smart people doing cutting-edge work. The organization is well-connected and respected by leaders not just in the environmental space, but in government, business, etc. Even though WRI has grown enormously, there is very much still a scrappy, all-hands-on-deck atmosphere, which means that young people with a drive to succeed can take on responsibility quickly. If you care about environmental issues and research, you will definitely make close friends here. For all of the faults I'm listing, the majority of the staff is genuinely passionate about their work and want to do good work.
Cons
Unfortunately, the pay and benefits are below what other similar NGOs offer. HR is a non-existent disaster, meaning that promotions, pay raises, bonuses, etc. are given out unfairly and inconsistently (and with *zero* transparency). There is little to no effort put into professional development - instead it's more of a "figure it out on your own" attitude. Senior leadership prioritizes fundraising over staff management and promotes people to lead departments who are good at bringing in grants, but lack any management skills or experience. Over several years, I heard multiple managers express to junior staff that they "didn't see any more growth potential" in their roles, so talented and ambitious staff leave after 1-3 years. There is enormous turnover and churn among young (mid 20s - 30s), dedicated staff who love the organization but leave because of these frustrations.