In a more acidic ocean, shellfish, plankton and corals struggle to adapt.
CO2 mixes with seawater to form carbonic acid, making the oceans more acidic.
As the climate warms, rising sea levels will mean more damage from hurricane storm surge.
The city recorded more than 7 inches of rain in 24 hours, the third-highest single day rainfall total for any day since record-keeping began in 1891.
Greenhouse gases are trapping a lot of heat in the climate system and most of it is ending up in the ocean.
Since the advent of modern recordkeeping in 1880, the global average temperature has risen 1.6°F.
If CO2 emissions continue at the current pace, pollen counts are projected to nearly double by 2060.
This year's sad California snowpack "obliterates" the previous record low.