首先，需要明确文章的主题和要点，然后在第一段进行总体概括和趋势描述。可以通过以下几个步骤：

1. 阅读题目和相关材料，理解文章的主题和要点。

2. 总结文章的主要内容，包括问题、原因、影响等。

3. 描述当前的趋势和发展方向，可以使用一些形容词或副词来表示，如“逐渐增加”、“不断扩大”、“日益严重”等。

4. 引出下文的论述，为接下来的段落做铺垫。

例如，如果文章的主题是“环境污染”，第一段可以这样写：

Environmental pollution has become a major concern in recent years. With the rapid development of industry and urbanization, the problem of pollution has become increasingly serious. The trend of pollution is showing no signs of slowing down, as more and more people are joining the urban population and the demand for energy and resources continues to grow. In this essay, I will discuss the causes and effects of environmental pollution and propose some solutions to address this issue.