“你，我和其他人都在這個地球上。而你關(guān)心的人又有多少呢？”這一句話便道出了n=1這個人人都在施行的方程式，即人類面臨的各種問題包括氣候變化、環(huán)境污染、生態(tài)破壞都沒有影響到我本人，所以不足為慮。這樣的做法直接導(dǎo)致問題越來越多，也越來越嚴(yán)重。實際上，每個人都是地球的一員，個體的行為都會影響地球的發(fā)展，再推至自身及子孫后代。所以，人們的方程式應(yīng)該是n=全人類。

There's you， there's me and there's everyone else on the planet. How many of those people do you care about？

Good news！ If you’re like most Americans， you don’t have much reason to worry about the dangerous state of the world. Take Ebola. Do you have it？ No， you don’t， and neither does anyone in your family. As for Ukraine， it’s not your neighborhood， right？ Ditto ISIS.

Reasonable people might argue that a position like this lacks a certain， well， perspective， and reasonable people would be right. But that doesn’t mean it’s not a position way too many of us adopt all the same， even if we don’t admit it. If it’s not happening here， it’s not happening at all -- and we get to move on to other things.

I was put freshly in mind of this yesterday， after on the newest -- and arguably least honest -- argument being used by the dwindling community of climate deniers， and then posted the link to the piece on Twitter. Yes， yes， I know. If you can’t stand the tweet heat stay out of the Twitter kitchen. But all the same， I was surprised by one response：

“Just out of curiosity， how has ‘climate change’ personally affected you？ Has it brought you harm？”

And right there， in 140 characters or less， was the problem -- the all-politics-is-local， not-in-my-backyard， no-man-is-an-island-except-me heart of the matter. It is the sample group of one -- or， as scientists express it， n=1 -- the least statistically reliable， most flawed of all sample groups. The best thing you can call conclusions drawn from such a source is anecdotal. The worst is flat out selfish.

No， climate change has not yet affected me personally -- or at least not in a way that’s scientifically provable. Sure， I was in New York for Superstorm Sandy and endured the breakdown of services that followed. But was that a result of climate change？ Scientists aren’t sure. The run of above-normal， heat wave summers in the city are likelier linked to global warming， and those have been miserable. But my experience is not really the point， is it？

What about the island nations that are all-but certain to be under water in another few generations？ What about the endless droughts in the southwest and the disappearance of the Arctic ice cap and the dying plants and animals whose climates are changing faster than they can adapt -- which in turn disrupts economies all over the world？ What about the cluster of studies just published in the Bulletin of the American Meteorological Society firmly linking the 2013-2014 heat wave in Australia -- which saw temperatures hit 111oF （44oC） -- to climate change？

Not one of those things has affected me personally. My cozy n=1 redoubt has not been touched. As for the n=millions？ Not on my watch， babe.

That kind of thinking is causing all kinds of problems. N=1 are the politicians acting against the public interest so they can please a febrile faction of their base and ensure themselves another term. N=1 is the parent refusing to vaccinate a child because， hey， no polio around here； it’s the open-carry zealots who shrug off Sandy Hook but would wake up fast if 20 babies in their own town were shot； it’s refusing to think about Social Security as long as your own check still clears， and as for the Millennials who come along later？ Well， you’ll be dead by then so who cares？

N=1 is a fundamental denial of the larger reality that n=humanity. That includes your children， and it includes a whole lot of other people’s children， too -- children who may be strangers to you but are the first reason those other parents get out of bed in the morning.

Human beings are innately selfish creatures； our very survival demands that we tend to our immediate needs before anyone else’s -- which is why you put on your own face mask first when the plane depressurizes. But the other reason you do that is so you can help other people. N=all of the passengers in all of the seats around yours -- and in case you haven’t noticed， we’re all flying in the same plane together.