Marine ecosystems may be tougher than we think. A survey questioned researchers who had documented the negative effects of climate change to marine ecosystems such as coral reefs and kelp forests. But most of those researchers also noted instances of resilience. For example, in western Australia, a coral reef lost 90 percent of its live coral after a bleaching event. Yet when researchers checked back 12 years later, the reef had grown back to 44 percent of its normal size.