Final answer:
Donald Trump's election led to a decline in membership and contributions to environmental organizations due to his policies and actions.
Step-by-step explanation:
Donald Trump's election led to a serious decline in membership and contributions to environmental organizations. His policies and actions, such as withdrawing from the Paris Agreement and rolling back environmental regulations, are believed to have contributed to this decline.
For example, Trump's support for the oil industry and his decision to permit oil drilling in national wildlife refuges drew criticism from environmentalists. Additionally, his skepticism about climate change and his focus on economic growth over environmental protection may have deterred some individuals from supporting environmental organizations.
This decline in membership and contributions highlights the influence of political events and government actions on environmental movements and organizations.