End Ron Johnson's climate change denial, 2010-'16

In the beginning, in 2010, there was ignorance:

A global warming skeptic, Johnson said extreme weather phenomena were better explained by sunspots than an overload of carbon dioxide in the atmosphere, as many scientists believe. 

"I absolutely do not believe in the science of man-caused climate change," Johnson said. "It's not proven by any stretch of the imagination."

In 2013, there was voter education:

The League of Conservation Voters is investing real money — $2 million — in a TV ad campaign targeting a handful of Republican lawmakers for their climate denialism. Here is a first look at the ad targeting Senator Ron Johnson of Wisconsin over his outsized comments about climate change.

 
Now, with Johnson having made no progress, it's time to hold him accountable:

MADISON, Wis. (AP) — Republican U.S. Sen. Ron Johnson of Wisconsin is downplaying concerns about climate change, saying "civilization thrives" in warmer weather and people will adapt.

After all, how many reasons do you need? 

Wisconsin GOP US Senator Ron Johnson took another shot at Democratic opponent Russ Feingold for having obtained a Harvard Law School education. 

He's done it before, describing Feingold as a "little maverick" who went to Harvard, and, gasp!, Oxford, which is you go if you win a super-prestigious Rhodes scholarship. 

Before I get to the Harvard matter, wait, what? "...little maverick guy..." 

How much contempt can one insecure office-holder bring to one interview wrapped in basic anti-intellectual GOP outsider labeling... 

This attack on Feingold and college education is clearly GOP focus group, campaign consultant-tested-and-scripted, with the worst of divisive motivations, because Wisconsin has a very large percentage of voters without college degrees, and Johnson is demagoguing right at them. 

With Scott Walker right behind him, keeping to his Trump endorsement - - and given cover by the state's largest newspaper which refuses to make him adhere to any measure of accountability - -  leaving Walker free to work hard to keep Johnson in the Senate where he could block Hillary Clinton's agenda.