All these cause bleaching: Temperatures (too high and too low), Sunlight (too much and too little), salinity (too much and too little), pH (too high and too low), and others like too much fresh water, silt, and other chemicals. Bleaching is a temporary absence of algae which are ejected by the corals depending on water conditions -- and after which they wait for other algae to float by which better accommodate current conditions. If they can't find new algae after a length of time (depending on conditions) then the corals die -- adding to the already growing bedrock of reefs -- until new corals start growing again after conditions and algae availability changes. This is their life cycle -- it is normal -- and warmer waters and more CO2 are both beneficial to coral growth -- it is in the historic fossil record.

Better yet, go to the Arctic and Antarctic and see it for yourself instead of listening to some "guru" pandering to your belief in global conspiracy theories. Some of us have actually been places and have seen the damage to the melting glaciers, the damaged and dieing coral reefs, air so foul you can hardly breath.
Deny it all you want. Cling to whatever misinformation or manipulated data you wish. Sooner or later all the legitimate data will make anthropogenic climate change undeniable to any but the most fervent conspiracy theorists.

Why are polar bears increasing and why do they allow shooting them?

Great source. A for profit trophy hunting outfit trying to make a buck selling you the chance to kill a bear.

Why are the bears increasing and why do they allow hunting?

Trends
 

I agree that seven years is not a trend. I also believe one hurricane is not a trend (Ian is definitely climate change, say some). There are fewer hurricanes in the past 30 years, though some recently have held more water because the ocean is a little warmer. There is climate change (always), some is man made, and politicians choose whichever of the 33 common models looks the scariest for now in order to get people's votes and make us miserable (including some literal freezing and starvation coming soon in other countries) with attempting to stop fossil fuels entirely and as soon as possible. China is increasing coal and the West unable to offset them to any significant degree. We should do what we can without actions that will cause great harm (unable to heat houses, banning nitrogen fertilizer without which there will be some stavation, etc.)

Let's all fly to a far away country to discuss how bad climate change is.

Your CBS NEWS article is from “ CBC News · Posted: Sep 05, 2018 4:00 AM CT | Last Updated: September 5, 2018”

Funny! Who would have thought there might be icy conditions in areas above the arctic circle?

The fact that such a cruise would even be possible, that those areas might be free from ice long enough for the cruise, might be considered evidence in support of warming.

And why did the ice come back just 2 years after the so-called hottest July ever in 2016? Andy why are the Polar Bears increasing? And why did Al Gore's 2009 forecast for an ice-free North Pole by 2014 fail? And why is there more Arctic sea-ice now than when Al Gore made that fear-mongering forecast?

Oh good, another climate denier thread. Me, I prefer dog poop threads.

You already provided the answer to the hunting: $50,000.

As for the number increasing, don't know if that's even true and don't know what it has to do with warming. It's not difficult to imagine that the loss of normal habitat for the bears has forced them into new patterns and new areas that has led to a population increase. *IF* that is even the case.

I think the phrase for Brian is more like "pompous ass".

There is global warming -- we are still thawing out from the Little Ice Age.

But didn't you say we were in a seven year cooling trend and sea ice was increasing?

Let me try to put all this together:

The cruise was canceled because of the excess ice during a warming period while we are in a cooling trend where we are thawing out and sea ice is increasing.