Message and messenger has always been intertwined; hard to imagine that teachings of Jesus or the Buddha would have been as well-received if their recorded actions showed them doing the opposite.
Great leaders lead by example, especially for things that require sacrifice or behavior changes. If climate change is supposedly the great threat to human civilization yet some of its messengers don't act like it is, then perhaps more people will think so too. Especially when the expanded use of fossil fuels is absolutely required to improve the living standards of Africa, India and other developing regions.
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