给定一段英文文章，生成一个主题列表，显示每个主题出现的次数。


文章:
In recent years, there has been growing concern about the impact of human activities on the environment. Many people believe that individuals have a responsibility to reduce their carbon footprint and adopt more eco-friendly behaviors. Governments and businesses also have a role to play in addressing environmental issues, through the implementation of policies and initiatives to promote sustainable development. Some of the most pressing environmental problems facing the world today include climate change, deforestation, and pollution.
主题列表：
- 环境保护（4）
- 个人责任（1）
- 政府角色（1）
- 企业角色（1）
- 可持续发展（1）
- 气候变化（1）
- 森林砍伐（1）
- 污染（1）