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Those of us in developed countries here are greatest responsibility to reduce energy consumption. People in the United States consume more energy than do the total population of Central and South America, Africa, India, and China combinedㅡabout 3.7 billion people compared to 270 million in the United States. Thus, the moderation of global warming depends mainly on the richest countries reducing their use of fossil fuels by conserving energy and developing alternative energy sources, such as wind, solar, and geothermal energy. We can help individually by becoming more energy efficient at home and reducing our reliance on the automobile.
[Source: Reading for Results Ninth Edition by Laraine Flemming]
I'd like to know if the past participle "combined" expresses the conditional.
And I'd like to know if the author omitted the object of "help," because the readers can deduce it through the context.
Thank you in advance for your help.
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Comments  
park sang joonI'd like to know if the past participle "combined" expresses the conditional.
I don’t know what you mean by that, but combined means as a whole.
park sang joonAnd I'd like to know if the author omitted the object of "help," because the readers can deduce it through the context.
Help is intransitive here.

intransitive verb

: to be of use or benefit

http://www.merriam-webster.com/dictionary/help
park sang joonI'd like to know if the past participle "combined" expresses the conditional.
No, it just means the total population of Central and South America, Africa, India, and China.
park sang joonAnd I'd like to know if the author omitted the object of "help," because the readers can deduce it through the context.
Yes. An object is not required.
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park sang joonThose of us in developed countries here are greatest responsibility
Those of us in developed countries have the greatest responsibility
Thank you, AlpheccaStars, for your very helpful answer.Emotion: smile

People in the United States consume more energy than do the total population of Central and South America, Africa, India, and China combined.

Then, I think "combined" modifies "population"
If so, I'd like to know why "combined" is positioned at the end of the sentence.
People in the United States consume more energy than do the total population of Central and South America, Africa, India, and China (when the populations are) combined.

It is an example of a post-modifier, which usually is a clause or prepositional phrase.

Another example:

At the banquet last night, there were more than 500 people served.
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Thank you, AlpheccaStars, for your continuing support. Emotion: smile

"People in the United States consume more energy than do the total population of Central and South America, Africa, India, and China (when the populations are) combined."
I'd like to know if you meant "combined" is a past participle implying a time.

"At the banquet last night, there were more than 500 people served."
I'd like to know if it says only the five hundred of the attending people were served.
park sang joonI'd like to know if you meant "combined" is a past participle implying a time.
It is a past participle. Because it is not an inflected verb, no time is implied.
park sang joon"At the banquet last night, there were more than 500 people served."I'd like to know if it says only the five hundred of the attending people were served.
No. It says "more than 500", not "only 500."
Thank you, AlpheccaStars, for your continuing support.

It is a past participle. Because it is not an inflected verb, no time is implied.
"total population of Central and South America, Africa, India, and China combined"
Then, I'd like to know if "combined" modifying "population" is positioned at the end of sentence due to the long "of" prepositional phrase.

No. It says "more than 500", not "only 500."
1. At the banquet last night, there were more than 500 people served.
2. At the banquet last night, there were served more than 500 people.
Then I'd like to know if #1 means #2
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