Sustainability pages have duplicate page titles

[alexgibson]

Description

The following three pages all have the same <title>: Mozilla is CarbonNeutralⓇ certified — Mozilla

• https://www.mozilla.org/en-US/sustainability/
• https://www.mozilla.org/en-US/sustainability/carbon-neutral
• https://www.mozilla.org/en-US/sustainability/emissions-data

The pages are also missing meta descriptions

[alexgibson]

Oh, I also noticed that the /carbon-neutral/ and /emissions-data/ pages are both 404 when there's a trailing slash (will get this fixed right away): https://www.mozilla.org/en-US/sustainability/emissions-data/