The impact humans have had on our planet is taking its toll, and experts warn wedon't have long to reverse the current path before even more damage is done. Climate scientists are in almost unanimous agreement that the consequences of a warming planet are quite scary, and it's up to us to keep them from happening.

(MORE: )

The list is long, but here are four of the scariest things to ponder about the changing climate.

1. Climate Change Is Already a Public Health Crisis

Activists mimicking front line Ebola health workers protest to demand G20 action to fight the disease on Nov. 15, 2014 in Brisbane, Australia.

(Daniel Munoz/Getty Images)

One side effect of climate change is that heat waves will continue to last longer and be more intense. According to inmedical journal The Lancet, prolonged warmer weather is allowing infectious diseases to spread – and spread in unpredictable ways.

More frequent and intense floods have also provided more breeding areas for insects that carry infectious diseases, and weather whiplash isharming crops, which has led to more malnourishment around the world, the study also found.

The study, released Monday, is essentially a check-up on the health of the planet, and the results weren't good.

"When you go to the doctor and have high blood pressure or a fever, what the doctor does is take a measurement and ," Howard Frumkin, the study's co-author who once worked as aformer special assistant to the CDC’s director for climate change and health, told the Huffington Post. "That’s really what this is on a global scale."

2. Politicians Deny Climate Change Is an Issue at All

President Donald Trump announces his decision for the United States to pull out of the Paris climate agreement in the Rose Garden at the White House, June 1, 2017 in Washington D.C.

(Win McNamee/Getty Images)

What's the first step to fixing a problem? Usually, it's admitting you have a problem in the first place. That's been a difficult task for the Trump administration, which has called climate change a hoax and that it would pull the U.S. out of the Paris Climate Agreement.

It's believed that the accord is the world's best chance to combine forces and fight climate change (more on that later), but Trump said he doesn't think the voluntary agreement, as it stands, is in the best interests of some American workers – like thosein the coal or oil industries. Therefore, despite the fact that only Syria remains as the other holdout from the climate agreement, Trump said the U.S. will not comply with its rules to reduce carbon emissions, though the nation isn't able to officiallyleave the accord until November 2020.

Trump is hardly the only government official to expressdoubt that climate change is being caused by humans. In March, the new head of the Environmental Protection Agency, Scott Pruitt, said he doesn't believe carbon dioxide is causing the planet to warm.

"I think that measuring with precision human activity on the climate is something very challenging to do and there's tremendous disagreement about the degree of impact, so no, I would not agree that it's a primary contributor ," he told CNBC.

Pruitt also echoed Trump's comments that the Paris climate accord is not a fair deal for the U.S., and said it should have gone through Senate confirmation before the nation officially joined.

3. It's Also a National Security Concern

The Navy aircraft carrier USS Enterprise rests at the pier as it is gutted before being officially decommissioned at Naval Station Norfolk in Norfolk, Virginia, May 8, 2013, during the Department of Defense's tour deemed Navy 101.

(JIM WATSON/AFP/Getty Images)

If there's one thing that might get Republican politicians talking about climate change, it's the threat to national security it poses. Several key American bases are located in areas where rising sea levels could threaten them, including Naval Station Norfolk, which , according to Inside Climate News.

But there will be another threat when the sea ice melts: shipping lanes could be changed, and it would add even more pressure on our military.

"How do we make sure our forces are ready, all the way from the Arctic to the tropics and everything in between, " retired U.S. Navy Rear Admiral David Titley asked during a discussion Monday at Michigan Technological University, as reported by WLUC-TV. "How are we going to protect our critical bases and our critical training infrastructure, and how do we better predict or forecast the next Syria?"

4. We're Not Even Close on Paris Accord Goals

With the Utah State Capitol in the foreground, a temperature inversion traps and fills downtown Salt Lake City with thick smog on Jan. 31, 2017 in Salt Lake City.

(George Frey/Getty Images)

So, about that climate agreement: It only works if the countries that signed it live up to the promises they made. As of right now, expected emissions reductions by 2030 are only expected to be one-third of the needed decrease to keep the planet , according to DW.com.

On this path, emissions reductions wouldn't even be enough to keep the planet from warming 3 degrees Celsius by 2100, and if that global temperature rise happens, climate experts say there will be no way to prevent catastrophe. In reality, global temperature rise needs to be limited to 2 degrees Celsius, or, even better, less than that.

Oh, and those woefully bad numbers were calculated before the U.S. pulled out of the climate accord. Factor in that the U.S. is one of the top emitters of greenhouse gases in the world, and concerns are bound to mount even more.

"Greenhouse gases are like ghosts in the climate system," said Bob Henson, weather and climate blogger at Weather Underground and author ofThe Thinking Person's Guide to Climate Change. "They're invisible, which makes them easy to ignore. But we can measure their accumulation in the air, and we can analyze how our climate is changing. These results are more than scary enough to get serious about emission reduction."