Oceans are in crisis this Earth Day; how scientists stay optimistic

AUSTIN (KXAN) -- As people around the world celebrate Earth Day this year by planting trees and turning off a few lights, scientists look toward the oceans. According to the United Nations, the ocean has "taken the brunt of the impacts" of human-driven climate change.

Things look pretty bleak. Rising sea temperatures could lead to half of marine species going extinct by the end of the century. UN estimates found that 60% of marine ecosystems have already degraded, while up to 90% of...