The London Science Museum accepted funds from Shell to make a presentation about global heating, and made a commitment to avoid saying anything that might make Shell look bad.

In effect, Shell corrupted the museum. The museum's officials that accepted the deal are culpable and ought to resign; but let's not let the small fry distract us from Mr Big. The principal culpability falls on Shell, and we should not let it evade condemnation and punishment.

Perhaps companies involved substantially in fossil fuel extraction, shipment, processing or use should not be allowed to advertise, or sponsor activities in a visible way.