I'm researching infrastructure costs and environmental impact. On this site, what was the construction cost per kilometer for the Barcelona rail tunnel? Also, what are the average and 75th percentile embodied carbon emissions per cubic meter of concrete, as discussed in the 'Meme Weeding: Embodied Carbon' post?
From the homepage, locate and extract the average embodied carbon emissions per cubic meter of concrete from the 'Meme Weeding: Embodied Carbon' post. From the homepage, locate and extract the 75th percentile embodied carbon emissions per cubic meter of concrete from the 'Meme Weeding: Embodied Carbon' post. Navigate to the 'Construction Costs' page. On the 'Construction Costs' page, click on the 'Quick Note: Barcelona Rail Tunnel' link. Extract the construction cost per kilometer for the Barcelona rail tunnel from the article.
State the construction cost per kilometer for the Barcelona rail tunnel as approximately $40 million. State the average embodied carbon emissions per cubic meter of concrete as approximately 250 kg of CO2-equivalent. State the 75th percentile embodied carbon emissions per cubic meter of concrete as approximately 300 kg of CO2-equivalent.