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The report's message is also beyond doubt: the extra half a degree makes a big difference.
報告所傳達(dá)的內(nèi)容信息也不容置疑：這高出來的0.5°C也會帶來很大不同。
Arctic summers could be ice-free once a decade in a two-degree world, but once a century in a one-and-a-half-degree one.
如果平均溫度上升2°C，北極夏季可能十年就有一次不結(jié)冰，但是若平均溫度上升1.5°C，就可能一個世紀(jì)一次。
Virtually all the ocean's coral might be irreversibly wiped out in a two-degree world, rather than 70-90% if temperatures rise by less.
平均溫度上升2°C，幾乎所有的海洋珊瑚都可能不可逆轉(zhuǎn)地消亡，而如果溫度上升的幅度小些，消亡數(shù)量可能減至70-90%。
Sea levels may rise an extra 10cm, washing away the livelihoods of millions more people.
海平面可能會再上升10厘米，使數(shù)百萬人失去生命。
Permitting a rise of two degrees could also see an extra 420m people exposed to record heat.
如果允許氣溫上升2°C，還會有4.2億人遭受創(chuàng)紀(jì)錄的高溫。
The 2°C target has been baked into climate policy for years—
多年來，氣候政策都定為允許氣溫上升2°C——
the number was first put forward by William Nordhaus, who shared the Nobel economics prize this week.
但2°C的目標(biāo)太松了。
It is too lax.
威廉·諾德豪斯第一次提出這個數(shù)字，他在本周共享諾貝爾經(jīng)濟(jì)學(xué)獎。
Hitting either target would entail transforming economies at a breakneck pace.
無論要達(dá)成哪一目標(biāo)，都要求經(jīng)濟(jì)以極快速度轉(zhuǎn)型。
To achieve 1.5°C, the world would by 2050 need to eliminate all 42bn tonnes of carbon-dioxide in annual emissions.
要達(dá)到控制溫度上升不超過1.5°C的目標(biāo)，到2050年，全球每年排放的420億噸二氧化碳需要全部消除。
Renewables, including hydropower, would have at least to treble their share of electricity generation from today’s 25%.
包括水力發(fā)電在內(nèi)的可再生能源在發(fā)電量中所占的比例至少要從目前的25%提高兩倍。
Internal-combustion engines, which power 499 out of 500 cars on the road today, would have to all but vanish.
內(nèi)燃機(jī)驅(qū)動汽車也得消失，如今，在公路上行駛的500輛汽車中，有499輛是由內(nèi)燃機(jī)驅(qū)動的。
Progress is being made.
但我們也正逐步取得進(jìn)展。
The number of electric cars on the road is rising fast;
路上的電動汽車數(shù)量正在迅速增加；
green finance is gathering momentum;
綠色金融蓄勢待發(fā)；
zero-carbon technologies are being developed.
零碳技術(shù)正在開發(fā)中。
But the scale of the effort required is unprecedented.
但所需的努力規(guī)模是前所未有的。
That is why reaction to the IPCC's report matters.
這就是為什么對IPCC報告的反應(yīng)很重要。
Some European Union environment ministers want to adopt 1.5°C as a guide to policy before a UN summit in Poland in December.
12月份，在聯(lián)合國波蘭峰會前，某些歐盟環(huán)境部長想采用1.5°C作為政策指導(dǎo)。
Their Australian counterpart called it "irresponsible" to phase out coal by 2050.
其澳大利亞同行稱到2050年逐步淘汰煤炭是“不負(fù)責(zé)任的”。
Donald Trump, who plans to withdraw America from the Paris deal, has not read it.
計劃讓美國退出巴黎協(xié)議的唐納德•特朗普沒有讀到這份協(xié)議。
A mix of alarm and apathy has both galvanised efforts to secure a 2°C future, and also bedevilled them.
警醒和冷漠的混雜態(tài)度鼓勵了未來升溫控制在2°C的目標(biāo)設(shè)立，也阻礙著這個目標(biāo)的實現(xiàn)。
A target of 1.5°C is no more likely to be met, but may nonetheless encourage the world to try harder.
盡管1.5°C的目標(biāo)更難實現(xiàn)，但是可以鼓勵世界各國朝此方向做出更多努力。
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