<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>super-serial</author><text>Carbon capture by weathering Olivine rocks is estimated to be $11.81 per metric ton of CO2.&lt;p&gt;&lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.innovationconcepts.eu&amp;#x2F;res&amp;#x2F;literatuurSchuiling&amp;#x2F;olivineagainstclimatechange23.pdf&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.innovationconcepts.eu&amp;#x2F;res&amp;#x2F;literatuurSchuiling&amp;#x2F;oli...&lt;/a&gt;&lt;p&gt;Rock weathering is a natural process, so there is no need to mess with transporting hydrogen or limestone to make some complicated chemical reaction.  We just need to dig up olivine, crush it and spread it out over the ocean which will also fix ocean acidification.  If we&amp;#x27;re going to geoengineer, weathering still seems like the least expensive option.</text><parent_chain><item><author>LargeWu</author><text>&amp;gt; The new paper says it can remove the same ton for as little as $94, and for no more than $232. At those rates, it would cost between $1 and $2.50 to remove the carbon dioxide released by burning a gallon of gasoline in a modern car.&lt;p&gt;If those numbers are true, that&amp;#x27;s actually a pretty achievable  cost to absorb that could be added directly as a tax on gasoline.</text></item></parent_chain></comment><story><title>Climate Change Can Be Stopped by Turning Air into Gasoline</title><url>https://www.theatlantic.com/science/archive/2018/06/its-possible-to-reverse-climate-change-suggests-major-new-study/562289/?single_page=true</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>btilly</author><text>The problem is that we want to not only put back in our future use of gasoline, but also our PAST use of gasoline.&lt;p&gt;That&amp;#x27;s going to be..not cheap.</text><parent_chain><item><author>LargeWu</author><text>&amp;gt; The new paper says it can remove the same ton for as little as $94, and for no more than $232. At those rates, it would cost between $1 and $2.50 to remove the carbon dioxide released by burning a gallon of gasoline in a modern car.&lt;p&gt;If those numbers are true, that&amp;#x27;s actually a pretty achievable  cost to absorb that could be added directly as a tax on gasoline.</text></item></parent_chain></comment><story><title>Climate Change Can Be Stopped by Turning Air into Gasoline</title><url>https://www.theatlantic.com/science/archive/2018/06/its-possible-to-reverse-climate-change-suggests-major-new-study/562289/?single_page=true</url></story>