全球變暖或引外星人毀滅地球？

The first spaceman to land on Earth may not be as friendly as ET。

In the latest bid to get us to cut greenhouse gases, scientists have decided that eco-conscious aliens disgusted by mankind's emissions could destroy our planet in disgust。

When observed from afar, the changes in Earth's atmosphere could label us as a civilization that has grown out of control。

Aliens reaching that conclusion may then launch a pre-emptive attack to protect this perceived threat to their own way of life。

電影《ET》劇照

But that is only one possibility. Scientists are also considering other unwelcome - and far-fetched - outcomes, such as aggressive extra-terrestrials who eat or enslave us, or perhaps they are industrial types who want to improve their own technological infrastructure and so pillage ours。

Lead researcher Shawn Domagal-Goldman and his team compiled a list of hypothetical situations to help us when we come into contact with other life forms。

Their suggestions include the issuing of warnings against broadcasts that might help aliens from learning about our biological make-up。

The first part of our contact, they add, should be limited to maths until we have a better idea of the type of ETI we are dealing with。

It would be particularly important for us to limit our emissions of greenhouse gases, since atmospheric composition can be observed from other planets。據英國《每日郵報》19日報道，來到地球的首個外星人或許不會像電影《外星人》中的主角ET一樣友好。

爲了敦促我們減少溫室氣體排放，科學家斷言，熱衷保護生態環境的外星人會對人類溫室氣體的排放感到難以容忍，並懷着厭惡之情摧毀我們的星球。

若從地球以外進行觀察，地球中發生的變化可能意味着，我們的文明已經走向失控。

得出這個結論的外星人或許會先發制人襲擊地球，以消除會對其生活方式構成威脅的不利因素。

但這僅是一種可能。科學家還在考慮其他一些令人難以接受的情況，比如具有侵略性的外星人會把我們當成食物與奴僕，或者外星人可能處於工業文明階段，他們希望改善自身的技術設施並因此對我們進行掠奪。

首席研究員肖恩-多馬加爾-戈德曼和他的團隊收集了一系列(有關外星生命的)假說，以便在我們與其他生命形態接觸時得到幫助。

科學家們的建議包括對使用廣播的警告，廣播可能會幫助外星人 我們的生物構成。

他們還說，在我們對外星人有更多瞭解之前，我們同外星人接觸的第一步應該僅限於數學方面。

減少溫室氣體的排放對我們來說就顯得尤爲重要，因爲其他星球(上的生物)能夠觀測到地球大氣的組成成分