Then again, the site also runs an all-purpose disclaimer that says:
“To become for its customers, the Internet’s fastest, most convenient, most comprehensive, and most reliable (my emphasis) source of climate change research and commentary; and for its partners, the fastest, most convenient, and most effective way to publish and market their work on the Internet.
It's hard to know what to emphasize in that paragraph. But they could have saved a lot of words with a Monty Python-style general warning:
We are not responsible if information we make available on this site is not accurate, complete, or current. The material on this site is provided for general information only and should not be relied upon or used as the sole basis for making significant decisions without consulting primary or more accurate, more complete, or more timely sources of information.
“We're the Heartland Institute: Run Away!!!!”