
Greg Craven
YouTube is incredible. The video below “How it all ends” is the updated version of one that received 1.5 million hits and helped net its creator, science teacher Greg Craven, a book deal with Penguin. Please God by all of us!
With rapid fire delivery, a funny hat and some simple high school science lab explosions, Craven makes one, simple point:
Even if there is doubt about the science of climate change (and the window for reasonable doubt about this has closed since Craven made his first video; the authoritative IPCC 2007 report calls the evidence for manmade climate change “unequivocal); we should still act.

Why? Because Climate change is life-threatening on a massive scale. Among the predicted effects over the 21st century are significantly more frequent and severe droughts and floods. These are events that, at their worst, can kill tens of millions. The costs of acting even if the scientific consensus is wrong about climate change are dwarfed by the costs of not acting if the consensus is right. Basic risk management. QED.
Here’s the video:
Jewish thinkers made the same point thousands of years ago. Saving life is a cardinal Jewish principle. The Torah teaches that humans were created, “in the image of God, (Genesis 1:26).” Each person partakes in the divine and is therefore of infinite value.
A famous Mishnah states:
“Therefore, man was created as an individual, to teach that if anyone destroys a life, it’s as if he has destroyed a whole world; and anyone who saves a single life, it’s as if he has saved a whole world.”
Each human being is likened to a whole world, of infinite value and irreplaceable uniqueness.
So the Torah requires us to take assiduous precautionary measures to prevent the needless loss of human life. The archetype for this requirement is the commandment to build a protective parapet around the roof of your house to prevent people from falling off and hurting themselves: “When you build a new house you shall make a parapet for the roof, and you shall not bring bloodguilt on your house.” (Deuteronomy 22:8).
In his authoritative code of halakhah, Maimonides generalizes from this mitzvah to other cases of potentially lethal danger:
“…so too for any case where there’s a danger that a person may unwittingly die from…there is a positive obligation to remove the danger and to be extremely careful about it…and if he neglects to do so and leaves impediments that can cause danger he has negated a positive commandment and violated “he shall not place blood guilt on his house.” (hilkhot rotzeakh, 11:4)
The Torah does not allow us to court danger and hope for the best. We cannot count on God to save us if we are stupid or negligent. The author of Sefer Hahinukh makes this clear in his explanation for the commandment to build a parapet around a roof:
“God created His world and based it on natural foundations. He made fire to burn and water to extinguish fire. So too, if a large stone falls on a person’s head, it will crush his brains and if he falls from the top of a high roof to the ground, he will die. The Merciful One,…breathed a living, intelligent soul into humans, so that they might save themselves from harm.”
It is not faith, but foolishness to dice with death and expect God to help. Divine mercy consists not in bailing us out of any danger that we bring upon ourselves, but in giving us the wit and wisdom needed to avoid the danger in the first place.
Today we call these “natural foundations” of the world scientific laws. If the best available scientific evidence shows that human actions are causing climate change that is likely to lead to massive loss of life, then the Torah clearly requires us to take whatever action we can to avert that threat. This is so, even if there is still a small measure of doubt about the science. Given the immense risks and dangers of delay, the precautionary principle derived from the mitzvah to build a parapet requires that we take action now.
For more on Climate Change Ethics and Jewish Thought, visit us at the Ethics Page of the Jewish Climate Initiative website. See you there!
I'm Julian, Co-Founder of
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