<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:  What are the major greenhouse gases responsible for global warming? Context: Major greenhouse gases responsible for global warming include carbon dioxide, methane, and nitrous oxide. Answer: [/INST]The major greenhouse gases responsible for global warming are carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O).</s>