A deal to steer the world away from catastrophic climate change was struck last December, and nations know it is now time to enact their action plans.
The goal is to limit global warming to under 2 deg C.
They have until April next year to sign the deal, and Singapore will do so in New York next month.
But even as the world moves to cut the use of fossil fuels and creates more efficient buildings and transport to curb greenhouse gas emissions, the escalating effects of climate change are already being felt around the world, from prolonged droughts to heatwaves and floods.
The Straits Times is launching a four-part weekly series in its Science pages, starting today, to highlight various aspects of climate change.
These range from its effects on habitats, to the measures that cities are taking to mitigate the effects of prolonged rain or dry spells, and technology to tackle the issue.
Today, we look at the effects of global warming on coral reefs, one of the habitats most threatened by climate change.