Limit #7 : freshwater use

The freshwater cycle is strongly affected by climate change and its boundary is closely linked to the climate boundary, yet human pressure is now the dominant driving force determining the functioning and distribution of global freshwater systems. Water is becoming increasingly scarce – by 2050 about half a billion people are likely to be subject to water-stress, increasing the pressure to intervene in water systems.

Water

Oceans

Will the ocean really be dead in 50 years?

But the ocean has taken a pummelling and we have not been treating it well. It is facing down three huge threats: overfishing, pollution and climate change. Most of these are caused by human mismanagement. Nature is stretching to breaking point. If we don't stop, the ocean could be drastically changed within our lifetimes.

www.nhm.ac.uk

Dying oceans rising faster than predicted, UN warns in stark report

Accelerating melting in Antarctica coupled with heating and acidification will push world's oceans into 'unprecedented' condition, the UN science panel said The accelerating thaw of Antarctica might drive sea levels up by more than five metres by 2300 unless governments act quickly to cut greenhouse gas emissions, a UN report said on Wednesday.

www.climatechangenews.com

Acidification and temperature rise

Ocean acidification - Wikipedia

Ocean acidification is the ongoing decrease in the pH value of the Earth's oceans, caused by the uptake of carbon dioxide (CO 2) from the atmosphere. The main cause of ocean acidification is human burning of fossil fuels. As the amount of carbon dioxide in the atmosphere increases, the amount of carbon dioxide absorbed by the ocean also increases.

en.wikipedia.org

Consequence, less oxygen in water, then in the air

Fresh water shortage