Climate change poses a significant threat to our planet, and it will take a global effort to address it.

This week, the leaders of almost 200 countries are headed to Paris to stand in solidarity with the French people after the attacks on their capital city, and to work together to protect our future by reaching a global agreement to reduce carbon emissions that are fueling climate change. President Obama will be there — and he took to his Facebook page to explain why.

See what he had to say here:

President Obama’s Facebook Post on Paris:

“I’m heading to Paris today to join nearly 200 countries for a global conference on climate change. It’s an opportunity to stand in solidarity with our oldest ally, just two weeks removed from the barbaric attacks there, and reaffirm our commitment to protect our people and our way of life from terrorist threats. It’s also an opportunity for the world to stand as one and show that we will not be deterred from building a better future for our children.

What makes this gathering different is that more than 180 nations have already submitted plans to reduce the harmful emissions that help cause climate change. And America’s leadership is helping to drive this progress. In fact, our businesses and workers have shown that it’s possible to make progress towards a low-carbon future while creating new jobs and growing the economy. Our economic output is at all-time highs, but our greenhouse gas emissions are down towards 20-year lows.

So what we’re trying to do in Paris is put in place a long-term framework for further emissions reductions – targets set by each nation, but transparent enough to be verified by other nations. And we’ll work to mobilize support to help the most vulnerable countries expand clean energy and adapt to the effects of climate change we can no longer avoid.

I’m optimistic about what we can achieve – because I’ve already seen America take incredible strides these past seven years. And with that – I’ll see you in Paris.”

There’s no “silver bullet” that will solve climate change. But, under President Obama, the U.S. has taken critical steps to curb our carbon emissions, and more than 180 countries have joined us — both the ones that emit the most and the ones most at risk — to announce their own climate plans.

It’s important that we keep up this momentum, because now is the time to act. If we don’t, Americans across the country will continue to suffer the consequences of climate change, from more intense heatwaves and superstorms to rising sea levels and threats to public health.

So follow along for live updates from Paris. And, if you’re seeing the impacts of climate change firsthand on the job or in your community, share them with us here.

The more people see what’s happening, the more they’ll realize that now is the time to act.”