When I was visiting my daughter at her college, she asked me about a terrifying story that ran in this newspaper on Oct. 2, reporting that the Arctic ice cap was melting “to an extent unparalleled in a century or more” — and that the entire Arctic system appears to be “heading toward a new, more watery state” likely triggered by “human-caused global warming.”

“What happened to that Arctic story, Dad?” my daughter asked me. How could the news media just report one day that the Arctic ice was melting far faster than any models predicted “and then the story just disappeared?” Why weren’t any of the candidates talking about it? Didn’t they understand: this has become the big issue on campuses?

No, they don’t seem to understand. They seem to be too busy raising money or buying votes with subsidies for ethanol farmers in Iowa. The candidates could actually use a good kick in the pants on this point. But where is it going to come from?

Generation Q would be doing itself a favor, and America a favor, if it demanded from every candidate who comes on campus answers to three questions: What is your plan for mitigating climate change? What is your plan for reforming Social Security? What is your plan for dealing with the deficit — so we all won’t be working for China in 20 years?

America needs a jolt of the idealism, activism and outrage (it must be in there) of Generation Q. That’s what twentysomethings are for — to light a fire under the country. But they can’t e-mail it in, and an online petition or a mouse click for carbon neutrality won’t cut it. They have to get organized in a way that will force politicians to pay attention rather than just patronize them.

Martin Luther King and Bobby Kennedy didn’t change the world by asking people to join their Facebook crusades or to download their platforms. Activism can only be uploaded, the old-fashioned way — by young voters speaking truth to power, face to face, in big numbers, on campuses or the Washington Mall. Virtual politics is just that — virtual.

Maybe that’s why what impressed me most on my brief college swing was actually a statue — the life-size statue of James Meredith at the University of Mississippi. Meredith was the first African-American to be admitted to Ole Miss in 1962. The Meredith bronze is posed as if he is striding toward a tall limestone archway, re-enacting his fateful step onto the then-segregated campus — defying a violent, angry mob and protected by the National Guard.

Above the archway, carved into the stone, is the word “Courage.” That is what real activism looks like. There is no substitute.