Germany was the first country to adopt a national policy on greenhouse gas emissions in 1990.

The primary objective of the Kyoto Protocol is to reduce greenhouse gas emissions by setting binding targets for industrialized countries.

The United States has the highest per capita greenhouse gas emissions, followed by Canada, Australia, and Russia.

Electricity generation is the main source of greenhouse gas emissions in most countries, followed by transportation, industrial activities, and agriculture.

Fuel efficiency standards are commonly used to reduce greenhouse gas emissions from the transportation sector by requiring vehicles to meet certain fuel efficiency requirements.

The primary focus of the European Union's Emissions Trading System (ETS) is to establish a carbon market that allows companies to trade emission allowances.

Germany has the most ambitious renewable energy target, aiming to generate 65% of its electricity from renewable sources by 2030.

The main objective of the Paris Agreement is to limit global temperature rise to 2 degrees Celsius above pre-industrial levels, with efforts to limit the increase to 1.5 degrees Celsius.

Costa Rica has the highest share of renewable energy in its electricity mix, with over 98% of its electricity generated from renewable sources.

The primary focus of the Green Climate Fund is to provide financial support for climate change mitigation projects in developing countries.

Sweden has the most comprehensive carbon pricing mechanism, covering all sectors of the economy and including a wide range of greenhouse gases.

The primary objective of the Global Methane Pledge is to reduce global methane emissions by 30% by 2030 compared to 2020 levels.

Sweden has the highest carbon tax rate, at approximately $130 per metric ton of carbon dioxide equivalent.

The primary focus of the Nationally Determined Contributions (NDCs) under the Paris Agreement is to set national targets for greenhouse gas emissions reductions.

The European Union has the most ambitious climate change mitigation target, aiming to reduce greenhouse gas emissions by 55% by 2030 compared to 1990 levels.