In an uncertain world, the one constant is American leadership headed by President Obama, according to this week's presidential address.

The president laid out the four "urgent challenges" the world is currently facing: "ISIL," "Russian aggression in Ukraine," Ebola in West Africa, and, of course, the climate.

Reeling from his speech before the United Nations this week, Obama touted his call to action of other nations to join America in these fights:

I called upon even more nations to join us on the right side of history.

"I worked to build more support for this coalition," the president said of his call to not act alone against "ISIL." The call went out to not only other nations, but to Muslims "to reject the ideology of violent extremism, and to do more to tap the extraordinary potential of their young people."

Obama assured that America is "leading the effort to rally the world" to stand against "Russian aggression in Ukraine" as well as the "corralling" of the Ebola outbreak in West Africa.

But the most dire of warnings addressed the imminent threat from the world's climate. President Obama called upon the world to "confront" the climate "before it's too late" and "for the sake of future generations."

The responsibility to lead the world is welcomed, Obama said. It flows out of America's "proud legacy of freedom" and it is a legacy that Obama's America is seeking to secure "for generations to come."