When Kelsey Singer, a student at Cedar Ridge High School in Round Rock, Texas, learned about a book her teacher had received in the mail – Why Scientists Disagree About Global Warming – she was perplexed and intrigued. Just who was responsible for what she considered to be a misinformation campaign?

So the college-bound senior created a website that investigates the “true nature” of the Heartland Institute, the Illinois-based organization responsible for the mailing. Her research, which went live on May 16, reflects Heartland’s ongoing efforts to discourage teaching of climate change, and the so-called “consensus” viewpoint on the scientific evidence, as a legitimate science curriculum topic.

This surely is not the first time Heartland has striven to conjure up climate science doubt where most climate scientists see little uncertainty. But this recent Heartland initiative may well reach a sizable portion of the nation’s primary and secondary school educators: PBS’ Frontline reports that some 200,000 K-through-12 U.S. teachers are slated to have received it by the end of 2017. The Heartland effort includes a well-designed book and a DVD. What’s more, the package is provided free of charge, not insignificant for teachers in the nation’s cash-strapped public schools.

But for Singer’s teacher, Nicole D’Augereaux, and apparently also for many others who opened the Heartland package, something didn’t smell right.

Colorado Springs-based chemistry teacher Linda Cummings, for instance, didn’t even bother to flip through the pages. She was turned-off right away by the cover letter, which suggested students would be “better served” if they are taught about the “vibrant debate among scientists on how big the human impact is, and whether or not we should be worried about it” [italics in original].

It wasn’t just the letter’s unscientific rhetoric and “defensive” tone that kept her from reading on, however. She says she’d already learned “it was pseudo-science” from a teacher she follows, and trusts, on Twitter.

Educators take to social media

Across the country in Cartersville, Georgia, Woodland High School teacher Brandie Freeman received a copy of the Heartland book and video earlier this spring. Like most other teachers, she was too busy to address it while school was in session.

But during spring break, she found herself compiling a chapter-by-chapter synopsis of the book, complete with robust sourcing, in which she dissected the book’s efforts to undermine science education. By early May, the advanced placement environmental science teacher said, her Heartland critique blog had gotten more than 25,000 hits, mostly from teachers.

The Heartland book offers plenty for a studious teacher like Freeman to unpack, from its assertion that there is “no consensus” about climate change (which there is), to its selective use of data (such as a 21-year-old about uncertainty in climate science). Freeman says she finds the book authors’ efforts to discredit the peer review process “alarming.”

Of efforts to disregard a “consensus” among climate scientists on the warming of Earth and its causes, Freeman says, “Sometimes people use that as an argument for teaching both sides of climate change when there really isn’t but one side.”

Through her proactive response and a strong Twitter following, Freeman’s initiatives have helped spark others to also speak-out against efforts to undermine science education.

Glenn Branch is deputy director of the National Center for Science Education, NCSE, an Oakland, California-based nonprofit that monitors climate change education and that clearly reflects the views of the vast majority of experts in the climate science community. Branch has been tracking teachers’ responses as part NCSE’s efforts to develop classroom resources refuting the Heartland mailing.

He estimates that roughly three quarters of the teachers he’s seen engaging in social media or posting on science education listservs have said they simply dismissed the book. Here are a few highlights he’s seen as public comments on Facebook, ranging from the sarcastic to the alarmed:

“I and my colleagues have received them. We’ve filed them where they belong ♻ [recycling symbol].” – Rick B., Cincinnati, Ohio;

“All high school science teachers I know tossed that piece of crap straight into the recycling bin … I kept mine as an example of propaganda.” – Gerardo C., St. Louis, Missouri;

“I recycled mine and sent an informative e-mail about it to the science teachers at my school. I also used their prepaid post card to write and tell them we don’t do alternative facts in my classroom!” – Chantal C., Ellittsville, Indiana;

“Next, ‘why scientists disagree on the earth going around the sun.'” – Lloyd P., Atlanta, Georgia;

“Got my copy and properly tore it into little pieces and gingerly sprinkled it over the recycling bin. Made a table top hovercraft out of the CD. Reduce, recycle, reuse and refuse! Love those four R’s!” – Debbie F., Greater Chicago, Illinois.

Still, some teachers are more susceptible to the book’s razzle-dazzle and its message than others.

Teachers still sending mixed messages about climate

As Sonya J. of St. Paul, Minnesota, wrote on Facebook, “It is hilarious reading, but also scary how many will fall for the slick look.”

A recent study justifies her concern, indicating that 30 percent of public school science teachers are teaching students that there is substantial disagreement among scientists about the causes of global warming.

These teachers could be more susceptible to such claims at a time when the President and many in his party in the Senate and House are dismissive of climate science.

“In some cases the Heartland materials may reinforce prejudices that teachers have who doubt or deny climate change. And it might induce people who are on the fence to teeter over,” says Branch. “The worry is that the people least likely to check its nature are the most likely to be influenced by them.”

Some of that susceptibility can be traced back to the absence of a clear climate science education pathway for teachers. Some senior-level science teachers may have gotten their teaching certificates long before climate science became as advanced as it now is.

Plus, it’s not just high school science teachers who are receiving the book, or who are discussing climate change in class. Freeman points out that a broad range of studies will touch on climate change organically, such as government and social studies classes and those dealing with language arts.

Teachers having had no refresher on climate science – or whose coursework never required it be learned in the first place – often are left to gather their information either from casual conversations or from random reports that haven’t been updated for a decade or more.

“In that case,” Freeman fears, “you might be more likely to embrace a book that says 2016 on it, and think, oh, this is up-to-date.”

Of course, there are also some teachers who flat-out reject climate science altogether. Freeman says at least half the people she encounters in her daily life, both in and out of work, don’t think “anthropomorphic climate change is a thing.”

Both share the belief that there’s no use trying to convince adults who are hard-wired not to accept the science.

But can you guess who they have found is open to empirical data? Students. And that’s why some teachers are turning the unscientific claims on their head.

Discussing evidence to empower students

“In my classroom, I know I change the minds of my students because they come preloaded with their parents’ conceptions,” says Freeman. “By the time I finish the unit, I would say 59 out of 60 students are ‘on board.'”

One of Freeman’s methods usually includes talking about rhetorical tactics. In fact, she says she received her copy of the book the same day that her class had been discussing how organizations, including Heartland, are often funded by powerful special interests to “weave this huge web of doubt about climate change.” And now, she’s got a current example.

“It actually helped me teach my students,” she says of the Heartland book. “And most of the teachers I talked to, what they were going to do was have kids go and look into the primary sources I pulled to argue against it … to use it as a way to further cement the fact that climate change is not controversial.”

A few teachers also posted about similar plans on Facebook, with Jeff W. of Utica, Michigan, and Kevin C. of Hazlet, New Jersey, among those mentioning they plan to use the Heartland materials to teach kids about vetting resources.

Using those materials as “teachable moments” may not be the ideal approach for every teacher, depending on their style, their class, and their community, says NCSE’s Branch. But he also points out that new research indicates that “inoculation” against climate misinformation could work much like a traditional vaccine.

“The idea is that if you expose students to climate change denial in a carefully controlled setting,” he says, “where you can make sure the problems associated with it are stressed and explained, then they’re better equipped to deal with it when they experience it outside the classroom, too.”

The academic focus on inoculation is fairly new, and there’s more to investigate. But informal observation shores up the idea that climate denial literature, when honestly considered, can often fall flat. One analysis of Reddit comments, for example, showed that a top reason people change their minds to accept climate science is that climate denial appears to be untrustworthy.

“I’m going to continue to use the book, to talk about it, and have it on hand as evidence – not evidence of a controversy, because that’s a façade,” says Freeman. “I don’t teach the controversy; I teach the corruption.”

The decision to not “teach the controversy” has worked well also for Cummings in Colorado Springs’s public charter school, called the Classical Academy, which she describes as “very conservative.”

“We turn the idea of a controversy on its head and instead teach the evidence; let the kids decide how they interpret the evidence,” she says. Her method: invite students to consider questions like, “Is climate change affecting Colorado?” Cummings says that when they look at signs like increasing wildfire, they usually decide that it is.

For Singer, the student who designed her own website, the potential of getting a good grade was a clear motivation. But she’s also hoping it will help inspire teachers and students to look at facts for themselves, and then draw their own conclusions.

Just that kind of objective thinking may result in an A for students – and for teachers standing up to climate misinformation.

Editor’s note: This article was lightly edited on May 31.