By now the news is stale, but on Friday Heartland pulled down the highly offensive billboards comparing the acceptance of mainstream climate science with such despicable people as the Unabomber.
They, however, refuse to apologize:
We do not apologize for running the ad, and we will continue to experiment with ways to communicate the ‘realist’ message on the climate.
Which lead to this humorous tweet from Robin Hickman:
following Heartland example, now if ever I do something offensive I shall say it was an “experiment” and refuse to apologise