I would like to present on global warming and the effects of El Nino's on Coral Reefs. Specifically, i would be looking at coral reef bleaching and most likely some ecological impact that bleaching has.
Here are three sources that i have found so far.
Climate change and coral reef bleaching: An ecological assessment
of long-term impacts, recovery trends and future outlook
The coral reef crisis: The critical importance...
Poorly cemented coral reefs of the eastern tropical
Pacific: Possible insights into reef development
in a high-CO2 world