写一个简单的英文文章，介绍什么是气候变化。
Climate change refers to the long-term alteration of global weather patterns and average temperatures, caused by the release of greenhouse gases into the atmosphere. These gases, primarily carbon dioxide, trap heat from the sun and lead to an increase in global temperatures, which can have a range of effects on both natural and human systems. Climate change is primarily driven by human activities, such as burning fossil fuels for energy, deforestation, and agriculture, and its impacts include rising sea levels, more frequent and severe weather events, and the loss of biodiversity. Reducing greenhouse gas emissions and adapting to the changing climate are crucial steps in mitigating the effects of climate change and protecting the planet for future generations.