Emission cuts: why sooner is better than later

This briefing by Zero Carbon Analytics argues that immediate and transparent emission cuts are essential to avoid ecological disaster, as the cumulative nature of CO2 means that delaying action increases peak temperatures even if net-zero targets are eventually met.

• The cumulative nature of CO2 means that the total amount emitted determines peak temperature; consequently, delaying emission cuts leads to more warming even if net-zero is achieved by 2050. Current emission rates are 10 times faster than any period in the last 66 million years, and the remaining carbon budget to maintain a 67% chance of limiting warming to 1.5°C was approximately 420 GtCO2 in 2018, with over 80 GtCO2 emitted in the following two years.
• Relying on 'overshooting'—where temperatures exceed targets like 1.5°C and are later lowered via carbon removal—is risky. Over 90% of IPCC emissions pathways consistent with 1.5°C in the long-term include an overshoot by 2050, yet carbon removal technology is not scaled; for instance, only five BECCS plants are operational, capturing 1.5 million tonnes of CO2, which is only 3% of Sweden's annual emissions.
• Immediate climate action provides significant co-benefits across health, economics, and employment. Limiting warming to 1.5°C could prevent approximately 150 million premature deaths in the 21st century. Economically, while climate solutions may cost USD 25 trillion globally, the resulting savings are five to six times larger, with potential net economic savings of USD 145 trillion from staying below 1.5°C.
• To maintain a chance of limiting warming to 1.5°C, UNEP indicates that annual global greenhouse gas emissions must drop to 25 Gt CO2e by 2030. However, progress is hindered by a lack of commitment from G20 nations, 15 of which have not committed to a net-zero timeline, and a lack of green investment in COVID-19 recovery, where only 12% of funds contribute to a green recovery.
• There is a critical need for transparency in climate pledges to distinguish between different goals. For example, China's goal to be "carbon-neutral" by 2060 appears to target CO2 neutrality, whereas California's 2045 goal aims to mitigate all greenhouse gases.

APA

Team, Z. (2021). Emission cuts: why sooner is better than later. Zero Carbon Analytics. https://zerocarbon-analytics.org/insights/briefings/emission-cuts-why-sooner-is-better-than-later/

Chicago

Team, ZCA. Emission cuts: why sooner is better than later. Zero Carbon Analytics, 2021. https://zerocarbon-analytics.org/insights/briefings/emission-cuts-why-sooner-is-better-than-later/.

Wikipedia

{{cite report |last1=Team |first1=ZCA |title=Emission cuts: why sooner is better than later |publisher=Zero Carbon Analytics |date=26 February 2021 |url=https://zerocarbon-analytics.org/insights/briefings/emission-cuts-why-sooner-is-better-than-later/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{team2021emission, author = {Team, ZCA}, title = {{Emission cuts: why sooner is better than later}}, institution = {Zero Carbon Analytics}, year = {2021}, month = feb, url = {https://zerocarbon-analytics.org/insights/briefings/emission-cuts-why-sooner-is-better-than-later/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }