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Our leaders cannot allow the Earth to become an unbearable hothouse | The Hill

Cannot?  Really?  This is the sort of nonfactbased crap I dislike.

Unless we take dramatic action to reduce greenhouse gas emissions, the very existence of life on planet Earth will be endangered.

Yeah, agreed. I mean, the worst case scenario endangers the existence of 8B human lives living on this planet, and the worst/worst case scenario endangers the existence of any human life... 

But ALL life? Nah... The planet will slough off any damage we can cause given a few hundred thousand, maybe a few million, years...

define endangered

Not saying this is likely, but endangered being "we f$&k up the planet's climate, affecting agriculture enough that we can't come remotely close to feeding everyone". And when the choice is between fight or starve, what do you think some of these countries are going to do? 

endangered
adjective

in danger of being harmed, lost, unsuccessful

Yes, which is the worst case scenario of climate change. 

it's vague enough that it could mean almost nothing or total extinction

I assume then that you didn't click through to the article and read it? 

The article actually clarified what was meant by endangered, right after the line CD quoted:

It is not as if our descendants will just have to get better air conditioners and stronger sunscreen. Unless we take dramatic action to reduce greenhouse gas emissions, the very existence of life on planet Earth will be endangered.
The U.N. tells us that the violent weather, which has become the norm today, threatens the world’s supply of food and clean water. In turn, global food and water insecurity poses a serious threat to America’s national security, according to the Center for Strategic & International Studies
Center for Strategic & International Studies. Indeed, hunger and thirst brought about by climate change will cause unimaginable mass migrations from have-not nations across the world, particularly Latin America, Africa and South Asia, endangering the stability of nations better equipped to cope, unless decisive climate action is taken. We have already received a foretaste of hunger-related migration on the U.S. southern border. As they say, we “ain’t seen nothin’ yet,” unless the GOP pitches in to avert the crisis.
But that is not all that we can expect from continued inaction. Climate scientists make the case that massive greenhouse gas emissions resulted in a number of mass extinction events in Earth’s past. The best comparison to present-day global warming occurred about 56 million years ago when massive volcanic emission levels, roughly comparable to the almost 40 billion tons we spew into the atmosphere each year, caused what is called the Paleocene Eocene Thermal Maximum, which resulted in the catastrophic destruction of flora and fauna across the globe. According to the geologic and fossil record, it took more than 150,000 years for the Earth to recover.
This may all sound alarmist, but it is time to get alarmed and activated. We are staring at a threat to the very existence of many life forms on the planet.

Agree or disagree, it's not like the author didn't give you an idea of what he meant. 

Unless we take dramatic action to reduce greenhouse gas emissions, the very existence of life on planet Earth will be endangered.

Yeah, this sentence is silly.
We've already bypassed whatever tipping point there is so that our comfy way of life will be gone in the next 100 years or so.  Miami, New Orleans, half of Bangladesh, and every island nation will be screwed by then.
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The ALERT message shouldn't be that life on this planet will be endangered, but that these changes tend to occur naturally at a much slower rate than they are now.  That's the human element - we're accelerating the time it takes for these climate changes to happen.  In turn, this makes it difficult or impossible (we don't know) for 'nature' to change along with it in a natural (ie - not man-caused) pace.
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Things will be different, we just don't know in what way.  Maybe the American west will become lush with grass and forests.  Maybe the island of Manhattan will be 8 feet under water.  Maybe footlong lizards will be as common as stray cats.  Maybe bikini shops will open in Juneau. 
People will have a less comfortable life (on the whole, on the average) and with no time to adjust, we don't know how nature will change.

We've already bypassed whatever tipping point there is so that our comfy way of life will be gone in the next 100 years or so.  Miami, New Orleans, half of Bangladesh, and every island nation will be screwed by then.
.  Maybe the island of Manhattan will be 8 feet under water.  

Do you have any basis for suggesting this as a possibility in 100 years?  What does the best current climate science suggest about sea level rise?  Do you have any idea?

The U.N. tells us that the violent weather, which has become the norm today, threatens the world’s supply of food and clean water. In turn, global food and water insecurity poses a serious threat to America’s national security, according to the Center for Strategic & International Studies

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I have trouble believing clean water is going away because of violent weather
as he states violent weather has become the norm - yet food and clean water are normal as well
is it threatened?  maybe, threats are just that.  

America's southern border has been an issue for a few decades.  It could be addressed if needed.

I think this is BS alarmist

The U.N. tells us that the violent weather, which has become the norm today, threatens the world’s supply of food and clean water. In turn, global food and water insecurity poses a serious threat to America’s national security, according to the Center for Strategic & International Studies

____________________________________________

I have trouble believing clean water is going away because of violent weather
as he states violent weather has become the norm - yet food and clean water are normal as well
is it threatened?  maybe, threats are just that. 

America's southern border has been an issue for a few decades.  It could be addressed if needed.

I think this is BS alarmist

I think you and I are extremely distanced from the realities of the food and water situations much of the world faces.  Sinks and grocery stores aren't a thing in much of the world.