What does this mean?

Sustained above-average temperatures, as the planet has seen so far this century, can affect the ice sheet, global sea levels, ecosystems, agriculture, coastal development, ocean acidification, rainfall and a number of cyclical rhythms. In 2016, we saw the worst ever coral bleaching event in the Great Barrier Reef – a direct result of increased sea water temperature. Changes to the ocean’s pH also prevent carbonate structures like shells from forming.

Organisations such as CSIRO, the International Energy AgencyNASA, the Intergovernmental Panel on Climate Change (IPCC)  and the US National Oceanic and Atmospheric Administration (NOAA) all agree that we must drastically reduce greenhouse gas emissions if we are to prevent catastrophic climate change into the future.