The major contributors to climate change include greenhouse gas emissions primarily from human activities such as burning fossil fuels (coal, oil, and natural gas), deforestation, industrial processes, and agriculture. These activities release carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and other greenhouse gases into the atmosphere, trapping heat and leading to global warming.

To address climate change effectively on an international scale, several key measures are essential:

1. Adopting renewable energy encourages and incentivizes the shift from fossil fuels to renewable energy sources such as solar, wind, hydroelectric, and geothermal power can significantly reduce greenhouse gas emissions.

2. Energy efficiency implements policies and practices that promote energy efficiency across all sectors, including industry, transportation, and buildings, which can reduce energy consumption and lower emissions.

3. Afforestation and reforestation protect existing forests and undertaking afforestation (planting new forests) and reforestation (replanting deforested areas) efforts can help sequester carbon dioxide from the atmosphere.

4. Technology transfer and capacity building in the aspect of supporting developing countries in adopting clean technologies and building their capacity to mitigate and adapt to climate change impacts.

5. Carbon pricing implements mechanisms such as carbon taxes or cap-and-trade systems to create financial incentives for reducing greenhouse gas emissions.

6. Research and innovation is another feature that investment should go towards. Research and development of innovative technologies and practices can further reduce emissions and enhance resilience to climate change.

7. Increasing public awareness about climate change impacts and the importance of individual and collective action, fostering behavioral changes that contribute to reducing emissions. This should start in schools and host public campaign to educate the public on the dangers that we may face in the near future.

By implementing these international measures comprehensively and collaboratively, the global community can work towards mitigating climate change, safeguarding the environment, and ensuring a sustainable future for generations to come.