以下是一道考研真题嵌套：

阅读下面短文，回答问题。

In recent years, the issue of climate change has become increasingly prominent in global discussions. The Earth's climate is changing, and this is largely due to human activities such as burning fossil fuels and deforestation. The consequences of climate change are severe and widespread, including rising sea levels, more frequent and severe weather events, and the extinction of many species.

One potential solution to climate change is the use of renewable energy sources. Renewable energy is energy that comes from natural sources that are replenished over time, such as sunlight, wind, and water. These sources of energy are cleaner and more sustainable than fossil fuels, which release greenhouse gases that contribute to climate change.

Solar energy is one example of a renewable energy source that has gained popularity in recent years. Solar panels can be installed on homes and businesses to generate electricity from the sun's rays. Wind energy is another example, with wind turbines used to generate electricity from the wind's kinetic energy. Hydroelectric power is also a renewable energy source, with dams used to generate electricity from the flow of water.

Despite the benefits of renewable energy, there are still challenges to its widespread adoption. One of the main challenges is the cost of installation and maintenance of renewable energy systems. Another challenge is the intermittency of renewable energy sources, which means that they are not always available when needed. However, with continued research and development, renewable energy has the potential to play a significant role in mitigating the effects of climate change.

1. What is the main cause of climate change?

2. What are the consequences of climate change?

3. What is renewable energy?

4. What are some examples of renewable energy sources?

5. What are the challenges to the widespread adoption of renewable energy?