An Inconvenient Truth (titles should be in italics) is a documentary film about global warming
that has beenwritten by former United States Vice President, Al Gore. This (what does "this" refer to? Try not to start a sentence this way because it can be unclear to the reader) is the area [in] which Al Gore has been interested in for many years, especially after he took a course with Roger Revelle, [a] climate expert at Harvard University. That (again, what does "that" refer to? See previous comment) made (perhaps something like "caused him" instead?) him travel ledaround United States and the world to educate and aware(perhaps something like "alert" or "bring awareness"?) people about the effects of theglobal w[a]rming and the climate change.
The documentary is based on [a]
"power point"Power Point presentation to[that]show[ed] graphs, charts, predictions , scientific models, data and a lot ofphotographs, which appear[ed] on a big screen behind Al Gore as he give his talk to support what he is saying["his ideas" maybe?] in front of many[a large] audience. In fact, the
of[for the]documentary his awareness campaigncame from [a] producer called [perhaps "named"] David, after he saw Gore's presentation at a global warming town-hall meeting in New York City in 2004, then they worked together to adapt the presentation into a documentary film.
^ I would maybe rewrite this sentence because it's a bit long and wordy. You could probably split this into 2 sentences. Feel free to ask if you need help!
Throughout the film, Gore focuses on different
activates[activities] that might humans do which[humans do that]contribute and affect onthe chemical composition of the earth's atmosphere and consequently, cause negative changes in our climate. One example of thatis the possibility of raising[the rising] sea levels by around 30 feet due to the collapse of ice sheets in Antarctica and Greenland. which leads to raise[This could lead the] refugees rate to reach 100 million.
In the last section of Gore's presentation, he said to his audience, "If appropriate actions are taken soon, the effects of global warming can be successfully reversed by releasing less carbon dioxide and planting more vegetation to consume existing carbon dioxide," which
make[made] people optimistic that they can[could] deal with these problems.
Green = comment/suggestion
Orange = Suggested changes
Well done! Some suggestions -- make sure to always do a spell check to avoid any typos/mistakes. Also, sometimes it is better to have 2 separate sentences instead of 1 long one because this can get confusing. Try not to start sentences with words like "this" and "that" unless it is very easy for the reader to tell what you are talking about when you say "this" or "that. I hope this helps! Feel free to ask if you have any questions :D.