請將下面這段話翻譯成英文：

　　目前，全球變暖是一個熱門話題，但是有關全球變暖的各項證 據似乎還有些不同的聲音。人們現在已經知道，地球的發展經歷了 很多周期,盡管在歷史上還未出現過像今天這樣的時代，即 高度工業化產生如此多的污染。全球變暖主要是由 于二氧化碳氣體的增多。

　　參考譯文：

　　Global warming is the hot topic around the world at this time but, there is also dissention about the evidence being presented to support the argument. The earth is known to go through cycles; although the past has never produced an age of so much industrialization causing the pollution currently being experienced. A major source of the problem is the increase in carbon dioxide levels.