The UN on Climate Change states that the Paris Agreement is a binding international treaty forged in 2015 which amongst other things seeks to limit global warming to less than 2 degrees above preindustrial levels.  In addition it proposes a preferable goal of 1.5 degrees above preindustrial levels.  A rise of 1.5 degrees Celcius being the temperature above which the oceanic currents and climate change reach critical and irreversible change.

In order to achieve these climate change goals we need to globally and swiftly combat global warming with a goal of net zero carbon emissions.  Planting trees and reforestation is a start and a way must be found to do this quickly.  If enough people were prepared to plant a tree every year it would go a long way to reverse the effects of global warming.  Keeping our oceans clean and healthy is a necessary next stage.  When you pick up rubbish that would otherwise end up in the ocean you participate in achieving this goal.