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I have a somewhat optimistic observation. I am not much worried about global warming. 

I went back to Korea for the first time in 1977 that was 12 years after when I left Korea.

It was September and I was miserable day and night due to the hot weather.

I thought to myself, "Was it this hot when I was here before 1965?" I was not sure.

But when I met my high school friends in Seoul, they don't seem to suffer from the heat.

While I was in a thin short-sleeved shirt, my Korean friends were wearing long sleeve shirt

and some of them even had a jacket on the top of it.

But they don't seem to be suffering from the heat while I was desperate in the hot and dusty air of Seoul.

They don't seem to be sweating as much as I did and seemed to be fairly comfortable.

I have sworn myself that I would never come back to Seoul in the summer.

That was when the idea of returning to Korea had been vaporized forever. Well, I am still in America.

This means that we, human beings, can adapt to the heat to a certain degree.

I was in America in the air-conditioned rooms for only 12 years.

The Korean friends of mine were still living without air-conditioning and they took the heat very well.

My observation tells me that we can adapt to the heat much easier than we think.

Anyway, by the time in 20-30 years when the earth gets really hotter,

I will be a handful of ash. Thanks a lot... Ha, ha, ha. 

So, I am not really worried. I don't envy the younger people who may live much longer than I do.

I am happy and fortunate to be an old man now. You see, I am right on time to leave the earth !!

Climate activist Greta Thunberg, 16, addressed the U.N.'s Climate Action Summit in New York City on Monday. Here's the full transcript of Thunberg's speech, beginning with her response to a question about the message she has for world leaders.

"My message is that we'll be watching you.

"This is all wrong. I shouldn't be up here. I should be back in school on the other side of the ocean. Yet you all come to us young people for hope. How dare you! 

"You have stolen my dreams and my childhood with your empty words. And yet I'm one of the lucky ones. People are suffering. People are dying. Entire ecosystems are collapsing. We are in the beginning of a mass extinction, and all you can talk about is money and fairy tales of eternal economic growth. How dare you!

NATIONAL 

'This Is All Wrong,' Greta Thunberg Tells World Leaders At U.N. Climate Session

"For more than 30 years, the science has been crystal clear. How dare you continue to look away and come here saying that you're doing enough, when the politics and solutions needed are still nowhere in sight.

"You say you hear us and that you understand the urgency. But no matter how sad and angry I am, I do not want to believe that. Because if you really understood the situation and still kept on failing to act, then you would be evil. And that I refuse to believe.

"The popular idea of cutting our emissions in half in 10 years only gives us a 50% chance of staying below 1.5 degrees [Celsius], and the risk of setting off irreversible chain reactions beyond human control.

"Fifty percent may be acceptable to you. But those numbers do not include tipping points, most feedback loops, additional warming hidden by toxic air pollution or the aspects of equity and climate justice. They also rely on my generation sucking hundreds of billions of tons of your CO2 out of the air with technologies that barely exist. 

"So a 50% risk is simply not acceptable to us — we who have to live with the consequences.

"To have a 67% chance of staying below a 1.5 degrees global temperature rise – the best odds given by the [Intergovernmental Panel on Climate Change] – the world had 420 gigatons of CO2 left to emit back on Jan. 1st, 2018. Today that figure is already down to less than 350 gigatons. 

"How dare you pretend that this can be solved with just 'business as usual' and some technical solutions? With today's emissions levels, that remaining CO2 budget will be entirely gone within less than 8 1/2 years.

"There will not be any solutions or plans presented in line with these figures here today, because these numbers are too uncomfortable. And you are still not mature enough to tell it like it is.

"You are failing us. But the young people are starting to understand your betrayal. The eyes of all future generations are upon you. And if you choose to fail us, I say: We will never forgive you. 

"We will not let you get away with this. Right here, right now is where we draw the line. The world is waking up. And change is coming, whether you like it or not. 

"Thank you."