The ICAA is an agreement between 196 countries to reduce greenhouse gas emissions
goal to prevent global temperatures rises by 2°C
Developed countries must "take the lead" by providing $100 billion to finance the strategies.
It is the first time that 196 governments have agreed to limit carbon emissions.
Many of the world's biggest polluters have agreed to substantial reductions in emissions. China has agreed to a 60% reduction and the EU has pledged a 40% reduction.
The USA (second biggest polluter) withdrew from the agreement from the agreement. President Donald Trump said that the deal was unfair to the USA. costing $3 trillion in GDP
The $100 billion/year cost makes it a very expensive policy.