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Global Climate Change01:50

Global Climate Change

29.2K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Heating and Cooling Curves02:44

Heating and Cooling Curves

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
28.3K
What is Climate?01:16

What is Climate?

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Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
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Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from...
3.1K
Hot Weather Concreting01:20

Hot Weather Concreting

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Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
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What is Weather?01:07

What is Weather?

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Overview
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関連する実験動画

Updated: Feb 28, 2026

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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エアコンの使用増加が地球温暖化を激化させる

Hongzhi Zhang1,2,3,4, Yuli Shan5, Ruoqi Li3,6,7

  • 1School of Economics, Beijing Institute of Technology, Beijing, China.

Nature communications
|February 25, 2026
PubMed
まとめ

エアコン（AC）の使用は、温室効果ガス（GHG）の排出を大幅に増加させ、地球温暖化を悪化させる。所得の増加はAC需要と排出量を増加させ、公平なアクセスを確保するためには低炭素冷却ソリューションへの移行が必要である。

キーワード:
エアコン地球温暖化温室効果ガス排出量低炭素冷却

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科学分野:

  • 気候科学
  • 環境科学
  • 社会経済学

背景:

  • 地球温暖化と社会経済的発展は、エアコン（AC）の使用を増加させている。
  • AC技術は、熱的快適性を提供する一方で、大量の温室効果ガス（GHG）を排出し、気候変動に寄与している。

研究 の 目的:

  • AC関連のGHG排出量とその温暖化影響を定量化すること。
  • 地球温暖化と社会経済的発展のAC排出量への寄与を区別すること。
  • ACアクセスにおける所得格差の役割とその排出量への影響を分析すること。

主な方法:

  • 5つの気候シナリオ（SSP）下でのAC関連GHG排出量のモデリング。
  • 気候変動による冷房需要と社会経済的要因の影響の分離。
  • AC排出量に起因する気温上昇の推定。

主要な成果:

  • SSP245シナリオでは、累積AC排出量（2010-2050年）は113.3 GtCO2eqと予測され、世界の平均気温を0.05℃上昇させる可能性がある。
  • 気候変動による冷房需要はこの増加の約8.3%に過ぎない。
  • 所得の増加は、不平等を減少させる一方で、排出量を大幅に増加させ（2050年までに14-146 GtCO2eq）、0.003-0.05℃の温暖化をもたらす。

結論:

  • ACの成長は、気候変動そのものよりも社会経済的発展によってより駆動される、実質的な気候課題を提示する。
  • 冷房アクセスにおける所得格差への対処は重要であるが、排出削減戦略とのバランスを取る必要がある。
  • 温暖化影響を緩和し、公平なアクセスを確保するためには、低炭素冷却技術への迅速な移行が不可欠である。