In the last 100 years atmospheric carbon dioxide has risen to about 30 percent above pre-industrial levels.
acidity
Ocean’s Acidity Increases In The Last 200 Years Than It Did In Previous 21,000 Years
As a result of human activities such as the burning of fossil fuels for energy and land-use changes such deforestation, the concentration of carbon dioxide in the atmosphere is now higher that it has been at any time over the last 800,000 years .