Was he supporting his speech? I think he gave a speech but used references and facts to support the assertions or conclusions made in his speech. Since "speaker" is singular, the possessive adjective should also be singular, "his" or "her". It would be unusual to hear this in the present tense unless someone was making the comment to you during the speech, in which case it would probably be in present progressive. i think this would more likely be said in the past tense. It is not just not a matter of personal opinion. The point is that the speaker made it clear to his or her audience that it was not his or her opinion. So here is a possibility: The speaker supported her assertions with references and facts so that no one would think that she was promoting her own opinions.

True.

Energy Consumption

Can you evaluate my essay. Thanks

<font face="Lucida Sans Unicode, sans-serif"><font color="#333333"><font face="Roboto, PingFang SC, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif"><font style="font-size: 11pt">The graph shows consumption of main energy resources in the USA since 1980 until 2030. There are two main features. </font></font></font></font>

<font face="Lucida Sans Unicode, sans-serif">
The accompanying graph shows consumption of principal energy resources in the USA from 1980 to 2030.</font>

<font face="Lucida Sans Unicode, sans-serif">(“Main” is ok. The synonym principal would work well here.) </font>

<font face="Lucida Sans Unicode, sans-serif">
<font color="#333333"><font face="Roboto, PingFang SC, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif"><font style="font-size: 11pt">The consumption of underground sources such as petrol, coal and natural gas increased steadily in long period. In 2005, natural gas consumption peaked and it is predicted it will not be increased until 2030 </font></font></font>
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<font face="Lucida Sans Unicode, sans-serif">The consumption of underground resources such as petroleum, coal and natural gas has increased steadily over the long term. However, the rate of natural gas consumption peaked in 2005 and it is predicted that it will not peak again until 2030.</font>

<font face="Lucida Sans Unicode, sans-serif">
<font color="#333333"><font face="Roboto, PingFang SC, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif"><font style="font-size: 11pt">On the other hand, there are no significant changes about renewable and alternative energy consumption. For instance, solar energy using was 3 quadrillion units in 1980 and it did not increase well. In conclusion, this graph illustrates the hunger of underground source consumption of the USA. USA did not try to produce energy with alternative and renewable way of doing it and it is expected that it will not happen. The underground sources is going to take more role on energy using.</font></font></font> </font>

<font face="Lucida Sans Unicode, sans-serif">On the other hand, renewable and alternative energy consumption rates have not changed significantly. For instance, in 1980 the consumption of solar energy was 3 quadrillion units and to date this rate has remained almost the same. </font>

<font face="Lucida Sans Unicode, sans-serif">The comparisons visible in the graph indicate a hunger for underground resources. There have not been great efforts towards producing more energy from renewable resources in the USA and this trend is not changing. We can conclude that underground resources will continue to be exploited at an ever increasing rate.</font>

<font face="Lucida Sans Unicode, sans-serif">( I was able to understand your essay. Good work! The changes I suggest here are mainly for clarity.)</font>

Do these sentences sound natural???

1. I can never get her to myself, she always has so many people around her.
2. I managed to get a glimpse of her through the crowd.

Crowd can be singular here.  It means a big group of people. Use plural if you mean more than one group of people.

3. I got the impression (that) she wanted to be alone. ( Or I got the feeling that she wanted to be alone?) 

or say it in present 

I get the impression(that) she wants to be alone. 

4 We stopped on the way to buy some breakfast, so it took us for a while.
5. If you can get some time off work, we can finish decorating tonight.