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US and Iran are world’s only major emitters [of greenhouse gases] without net-zero targets
(www.carbonbrief.org)
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.
Iran is a sovereign country able to set their own targets. They are members of the IPCC but deliberately chose non-participation for 15 years up to 2023. Furthermore, they had unfettered access to Chinese solar panels and wind turbines until recently. As they are the main supplier of oil for Chinese teapot refineries, trade for solar panels would have been simple.
Iran bears full responsibility for their outlier status no different than the current US regime.