yjk

I'm sorry, I do not understand the meaning of "yjk". Can you please provide more context or information?

What is the major cause of the greenhouse effect?

The major cause of the greenhouse effect is an increase in the concentration of greenhouse gases, such as carbon dioxide, methane, and water vapor, in the Earth's atmosphere. These gases trap heat radiating from the planet's surface and cause global warming, resulting in changes to the climate and environmental impacts. The main human activities that contribute to the increase in greenhouse gases include burning fossil fuels, deforestation, agriculture, and industrial processes.

Hello! It looks like you have entered "yjk", but I'm not sure what you are referring to. Could you please provide more context or ask a specific question? I'm here to help!