It often creates more problems, than it solves. Make the most of opportunities that do not require funding. It depends on the organization. They are often extremely effective. However, sometimes large organizations can be very slow moving.
Organizations often spend more time on membership and funding matters, than on environmental issues.
They also require that members seek a board's approval before beginning a project and throughout its implementation. Be aware that some environmental groups accept partial funding from government, corporations, or other sources that may compromise their decision-making process. Do not invite a lawsuit. Be careful of what you say and how you say it.