<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Provide a definition of the greenhouse effect. Context: The greenhouse effect is the process by which greenhouse gases trap heat in the Earth's atmosphere, leading to a warming effect. Answer: [/INST]It is the process by which greenhouse gases trap heat in the Earth's atmosphere, leading to a warming effect.</s>