Human contribution to global warming highest ever in 2025, says study

A new study — the annual *Indicators of Global Climate Change* report led by the University of Leeds and authored by over 50 international scientists — finds...

What Happened

A new study — the annual Indicators of Global Climate Change report led by the University of Leeds and authored by over 50 international scientists — finds that human-induced warming reached 1.37°C above pre-industrial levels (1850–1900 baseline) in 2025.
The rate of human-caused warming is now 0.27°C per decade over 2016–2025, the highest recorded rate since measurements began.
Greenhouse gas (GHG) emissions averaged 54.6 ± 5.5 billion tonnes of CO₂-equivalent per year over the last decade (2015–2024) — an all-time high.
A key contributing factor beyond rising emissions is the reduction in aerosol cooling: cleaner air from improved industrial air-quality standards means fewer reflective particles offsetting warming.
2025 marked the first time the three-year temperature average broke through the 1.5°C threshold set in the 2015 Paris Agreement.

Static Topic Bridges

The Paris Agreement and Temperature Targets

The Paris Agreement, adopted under the UNFCCC in December 2015, is the landmark international climate treaty that replaced the Kyoto Protocol. Its core temperature goal is enshrined in Article 2.1(a): holding the increase in global average temperature to well below 2°C above pre-industrial levels while pursuing efforts to limit it to 1.5°C.

The 1.5°C target was championed by particularly climate-vulnerable nations (Small Island States, least-developed countries) as a survival threshold.
The Agreement is legally binding on procedure (submission of Nationally Determined Contributions, or NDCs) but not on emissions outcomes.
NDCs must be updated every five years; each successive NDC is expected to be more ambitious (the "ratchet mechanism").
The Paris Agreement entered into force on 4 November 2016 after ratification by 55 countries representing at least 55% of global emissions.

Connection to this news: The 2025 data showing the three-year average crossing 1.5°C is the clearest signal yet that the Paris Agreement's most ambitious target is being breached, intensifying pressure on NDC ambition ahead of the next global stocktake.

Greenhouse Effect and Anthropogenic Forcing

The greenhouse effect is the natural process by which certain atmospheric gases (CO₂, CH₄, N₂O, water vapour, ozone, and fluorinated gases) trap outgoing longwave radiation from Earth's surface, warming the planet. Human activities — fossil fuel combustion, deforestation, industry, and agriculture — have dramatically increased the concentration of these gases since the Industrial Revolution, enhancing this natural effect and causing net warming known as anthropogenic forcing.

CO₂ concentration has risen from ~280 ppm (pre-industrial) to over 420 ppm by 2024.
Methane (CH₄) has a Global Warming Potential (GWP) approximately 80 times that of CO₂ over a 20-year period.
Aerosols (from industry and combustion) have a cooling effect by reflecting sunlight. As nations clean up air pollution, this masking effect is reduced — paradoxically accelerating warming in the short term.
The IPCC Sixth Assessment Report (AR6, 2021–22) concluded with "unequivocal" certainty that human influence has warmed the climate system.

Connection to this news: The new study quantifies that aerosol reduction is now compounding GHG-driven warming, which explains why the rate of warming has accelerated even without a sharp jump in emissions alone.

India's Climate Commitments and NDCs

India is the world's third-largest emitter of greenhouse gases (by volume) and is highly vulnerable to climate impacts. India's updated NDC (submitted in 2022) includes: reducing the emissions intensity of GDP by 45% by 2030 (from 2005 levels); achieving about 50% cumulative electric power installed capacity from non-fossil fuel sources by 2030; and creating an additional carbon sink of 2.5–3 billion tonnes of CO₂-equivalent through forest and tree cover by 2030.

India declared a net-zero target by 2070 at COP26 (Glasgow, 2021).
India is co-founder of the International Solar Alliance (ISA) — a treaty-based organisation with over 100 member countries.
India's National Action Plan on Climate Change (NAPCC) has eight national missions, including the National Solar Mission and the National Mission for Enhanced Energy Efficiency.

Connection to this news: Record-high human-induced warming strengthens the scientific basis demanding faster decarbonisation, placing greater scrutiny on India's pace of renewable energy transition and NDC implementation.

Key Facts & Data

Human-induced warming rate: 0.27°C per decade (2016–2025 average) — all-time high
Human-induced warming in 2025: 1.37°C above 1850–1900 baseline
Annual GHG emissions (2015–2024 average): 54.6 ± 5.5 billion tonnes CO₂-equivalent — all-time high
Paris Agreement temperature goal: 1.5°C (aspirational) / well below 2°C (binding target) — Article 2.1(a)
Paris Agreement entered into force: 4 November 2016
IPCC AR6 certainty on human causation: "Unequivocal"
India's net-zero target year: 2070 (announced COP26)