I would write: Tea is the second most popular drink in the world, with roots from Asia, it is considered the key export product for 50 countries whose climate and geographical location are suitable for growing tea.

This kind of thing is better suited to the Notebook section of the iTalki website. Anyway.... The following is my answer to a pte summary question. I need your suggestions and corrections for my summary. The summary must be one sentence of less than 75 words. That is why it is a long sentence. Tea, the second most popular drink in the world, with roots in Asia, is the key export product for 50 countries, which have the climate and geographical location (geographical location doesn't seem to add anything to your answe – it's not really specific enough) suitable (or required) for growing tea.