Wow, not much question about their intent, based on the language.
Not ‘attempt to duplicate the results’ or even ‘question’, just flat out ‘undermine’ the IPCC reports.

Funding for parallel organizations.
Heartland is part of a growing network of groups working the climate issues, some of which we support financially. We will seek additional partnerships in 2012. At present we sponsor the NIPCC to undermine the official United Nation’s IPCC reports and paid a team of writers $388,000 in 2011 to work on a series of editions of Climate Change Reconsidered. Expenses will be about the same in 2012. NIPCC is currently funded by two gifts a year from two foundations, both of them requesting anonymity. Another $88,000 is earmarked this year for Heartland staff,
incremental expenses, and overhead for editing, expense reimbursement for the authors, and marketing.