Paris climate agreement comes into force today! Will it work? Will it last?

From cnbc.com

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For many, November 4th will go down as an important day in the battle to save the planet and we need to go back to 2015 to understand why.

At last year's COP21 summit in Paris, after days of painstaking and fraught negotiations, world leaders agreed to make sure global warming stayed "well below" 2 degrees Celsius and to "pursue efforts" to limit the temperature rise to 1.5 degrees.

Today, that agreement comes into force.

"It's an historic day for so many reasons," Erik Solheim, head of UN Environment (UNEP), said in a recorded statement released in the hours before the agreement passed. "It shows the shift to a greener world is irreversible," he added. "It shows we're able to set aside differences to tackle common problems with consensus. It shows the world is swayed by good science and solid evidence."

On Friday, the International Energy Agency (IEA) stated that the agreement's ratification and coming into force showed that the world was "finally committing to tackling climate change" while WWF International's Manuel Pulgar-Vidal – who leads the body on climate change – wrote in a blogpost that the agreement had created "a unique framework for partnership among governments, businesses, civil society, faith groups and communities to collaborate and rally behind this crucial common cause for the planet."
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While there is some excitement for this being a step in the right direction, few believe this will be a complete solution to address the climate change issues. To add even more uncertainty, the upcoming US elections could completely change the optimism. Donald Trump has a very legitimate chance of winning the US election and has stated that he not only doesn't believe in man-made causes to climate change, but has stated he will dismantle the treaty. If the US and it's massive release of CO2 (in addition to hosts of other climate changing substances) withdraws, what are the chances other nations will continue to do the hard work while the US reaps any benefits. One look at a temperature map from 2016 and, if it is indeed a harbinger of things to come, and one has to worry.

Average surface temperature departures (source NASA GISS)