Source: (https://sea-birdscientific.com/pH/BlogPostAssets/images/oa_sbs_infographic.jpg)
This graph shows rising levels of carbon dioxide (CO2) in the atmosphere, rising CO2 levels in the ocean, and decreasing pH in the water off the coast of Hawaii.
Source: (http://www.pmel.noaa.gov/co2/file/pH+Time+Series)