The following three sites contain millions of crowd-sourced biodiversity observations! Have fun looking through the data to see which plants or animals have been seen recently near you or to explore biodiversity all across the world. All of this data can be used to contribute to conservation.
Mongabay – A good conservation news site that usually publishes articles about the latest conservation successes, setbacks, policies, new technologies, etc.
How effective are protected areas in conserving biodiversity? By Terry Sunderland