Yes, there are some examples of international collaboration on climate change. For instance:

The Paris Agreement is a landmark global pact that aims to limit the global average temperature rise to well below 2°C above pre-industrial levels, and pursue efforts to limit it to 1.5°C. It also sets out a framework for countries to submit and update their nationally determined contributions (NDCs) to reduce greenhouse gas emissions and adapt to the impacts of climate change. As of November 2021, 197 parties have signed and ratified the agreement.
The Montreal Protocol is an international treaty that aims to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). It also has a climate benefit, as these substances are also potent greenhouse gases. In 2016, parties agreed to amend the protocol to also phase down hydrofluorocarbons (HFCs), which are used as alternatives to CFCs and HCFCs but have a high global warming potential.
The Group of Twenty (G20) is a forum of major economies that accounts for about 80% of global greenhouse gas emissions. The G20 has been engaged in climate change discussions since 2008, and has endorsed the Paris Agreement and the UN Sustainable Development Goals (SDGs). In 2021, the G20 pledged to stop financing new coal-fired power plants abroad, and dozens of countries committed to phase out coal domestically by 2030 or 2040.
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