Climate Week NYC 2026

New York held its Climate Week from 20 to 27 September 2026, alongside the UN General Assembly's High-Level Week. The mood was less about announcing targets and more about whether existing ones are being met, paid for and explained.

From pledges to proof

Practitioners who attended dozens of sessions reported that the week was not a stage for new targets or net-zero pledges. The focus was on progress against existing commitments, where it has stalled, and what is needed to get unstuck. Some firms have stopped publicising their goals while still making operational progress. Advisers noted that business leaders were more cautious about taking speaking slots to outline net-zero visions, but remained focused on pushing transition plans forward.

Several recurring practical themes stood out:

• Assurance: Audit readiness was on everyone's list, with moving toward assurance a priority even for smaller companies.

• Scope 3: Businesses across industries still struggle with Scope 3, mainly over data collection and the validity of estimate-based calculations.

• Claims discipline: A legal director at Clorox said her team avoids vague words like "sustainable" in marketing copy, preferring credible, provable claims.

  
  

Climate Week felt like Energy Week

Energy moved to the centre. Discussions centred on electrification, grids, affordability and practical delivery, and one veteran journalist said the event increasingly felt like "Energy Week". At the opening, UK Energy Secretary Ed Miliband described climate change as a national security issue, part of a wider move to pitch clean energy as security, resilience and economic self-interest.

Affordability shaped the messaging too. In the US, Senator Ed Markey spoke about an "energy crisis" and rising bills rather than a "climate crisis". Bloomberg Intelligence research released during the week suggested Europe will spend €500 billion on climate resilience measures to 2035.

COP31 starts to take shape

The week also began setting the agenda for COP31 in November. Türkiye built support for a proposed target to raise electricity's share of global energy use from 23% today to 35% by 2035, backed by Australia and the EU. The proposal sits outside the formal negotiations. There is a credibility gap: Türkiye's own projections show it reaching only 25% electrification by 2035.

Politics: thin leadership from Washington

Senior political turnout at the UN climate summit was notably low, with island states and European countries among the most visible participants. Senator Brian Schatz said the world should move forward rather than wait for the US to return. Subnational actors filled some of the space. California's governor opened the state's participation by announcing new partnerships on clean energy, energy security and resilience, including an MoU with Spain. Cities were similarly active, and C40's recap said mayors spent the week sharing tangible results across energy, housing, extreme weather and resilience.

AI's energy appetite becomes a local political issue

AI was everywhere. It currently accounts for around 1.5% of global electricity use and could reach 3% by the end of the decade. UN climate chief Simon Stiell warned AI companies are on thin ice over their licence to operate, and Amazon's sustainability chief urged communities to hold the company accountable on data-centre practices. Participants found little agreement on who is responsible for managing risk and opportunity across the AI value chain.

Nature, science and finance

On the science side, the Global Commons Alliance's recap covered the launch of the Planetary Health Check 2026 and a convening where the Science Based Targets Network previewed updated 2026 methods and guidance, due later this year. On finance, one summit highlighted the tension between rising pessimism and capital flows: 62% of Americans doubt the world will do enough on climate, yet global clean energy investment hit a record $2.3 trillion in 2025.

The India thread

India's presence was lower-profile than the Western policy debates. On 24 September, the Consulate General of India in New York and UC Berkeley's India Energy & Climate Center hosted a panel on India's clean-energy transformation, with the MNRE Secretary sharing perspectives on renewable deployment and policy and market innovation.

What comes next

Climate Week now feeds the run-up to COP31. The next milestone is pre-COP, held in Fiji, Tuvalu and Australia on 5–8 October, with climate finance, green growth, energy and oceans expected to dominate, along with adaptation for Pacific island nations.

Bottom line: The week signalled a shift from ambition to execution. Energy security, affordability, assurance-grade data and AI's power demand now matter more than new headline pledges.