Ask MIT Climate works to answer questions that people have asked about our changing planet, the impact it will have to life on Earth, and what folks can do about it! Answers to all types of questions are provided by MIT faculty and scientists.

We’ve included list of questions and the start to answers below. The provided links will take you directly to the specific Ask MIT Climate question on MIT’s Climate Portal where you can get the full answer!

We also encourage you to browse Ask MIT Climate directly in the Climate Portal.

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What is “sustainability”? Is it the same thing as taking action on climate change?

Climate action is just one form of sustainability—a concept that asks us to see the big picture of what we are taking from the Earth, and how our actions affect future generations.

https://climate.mit.edu/ask-mit/what-sustainability-it-same-thing-taking-action-climate-change
Which is more likely: electric airplanes or hydrogen-powered airplanes?

For long-range flights with many passengers, liquid fuels like hydrogen are probably our best bet.

https://climate.mit.edu/ask-mit/which-more-likely-electric-airplanes-or-hydrogen-powered-airplanes
Is there a danger that pumping liquid carbon dioxide underground could have the same negative impacts as fracking?

Pumping carbon dioxide deep underground can cause earthquakes under certain conditions, but there are ways to prevent this.

https://climate.mit.edu/ask-mit/there-danger-pumping-liquid-carbon-dioxide-underground-could-have-same-negative-impacts
With low-carbon technologies improving so fast, does it sometimes make sense to wait to invest in new infrastructure?

It can make sense to wait for low-carbon technology to improve in efficiency and cost, but to slow climate change we must balance what makes economic sense with what reduces emissions the fastest

https://climate.mit.edu/ask-mit/low-carbon-technologies-improving-so-fast-does-it-sometimes-make-sense-wait-invest-new
What is the ideal level of carbon dioxide in the atmosphere for human life?

Atmospheric CO2 levels of between 280 and 350 parts per million created the climate that let humanity build and feed the modern world. The farther we get from those levels, the more we run the risk of disturbing that balance.

https://climate.mit.edu/ask-mit/what-ideal-level-carbon-dioxide-atmosphere-human-life
If cities require new buildings to use 100% electric heat, will that raise or lower their greenhouse gase emissions?

Electric heating can cause a short-term rise in emissions in areas that get their electricity from fossil fuels. But without electric heat, we can’t get greenhouse gas emissions to zero

https://climate.mit.edu/ask-mit/if-cities-require-new-buildings-use-100-electric-heat-will-raise-or-lower-their-greenhouse
Why did the IPCC choose 2°C as the goal for limiting global warming?

Scientists and policymakers have long agreed that global warming beyond 2° C above the pre-industrial average would pose large and escalating risks to human life as we know it on Earth, and governments have used that number as an organizing principle.

https://climate.mit.edu/ask-mit/why-did-ipcc-choose-2deg-c-goal-limiting-global-warming
Why do we compare methane to carbon dioxide over a 100-year timeframe? Are we underrating the importance of methane emissions?

This greenhouse gas is short-lived but has far greater heat-trapping potential than CO2. The more concerned we are about global warming over the next 10 or 20 years, the more emphasis we have to put on cutting methane emissions.

https://climate.mit.edu/ask-mit/why-do-we-compare-methane-carbon-dioxide-over-100-year-timeframe-are-we-underrating
Why do some people call climate change an “existential threat”?

The phrase can refer to a literal threat to humanity’s existence, but also to the danger that unchecked climate change can pose to our ways of life and place in the natural world.

https://climate.mit.edu/ask-mit/why-do-some-people-call-climate-change-existential-threat
Which parts of the planet are warming the fastest, and why?

The earth’s largest land masses and its north and south poles are warming the fastest, mainly because of differences in how these areas reflect energy from the sun.

https://climate.mit.edu/ask-mit/which-parts-planet-are-warming-fastest-and-why

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Climate sensitivity describes the extent to which rising levels of greenhouse gases affect the Earth’s temperature

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