More than two years after activists alleged that stolen e-mails from the University of East Anglia suggested a conspiracy to exaggerate the dangers of climate change, a new set of unauthorized disclosures shows that strategists at the Heartland Institute, in Chicago, have been seeking experts to promote a grade-school curriculum and make other public presentations that would cast doubt on those dangers. Those assisting the Heartland Institute include Robert M. Carter, an adjunct professorial research fellow in the School of Earth and Environmental Sciences at James Cook University, in Australia. The documents show that he was getting $1,667 per month for his work in “regularly and publicly” countering warnings about climate change. Mr. Carter told The Age, a newspaper in Australia, that he wouldn’t discuss his work with Heartland “with anybody outside of my family.”