https://phys.org/news/2018-07-urban-greenways-neighborhood-carbon-emissions.html

"These participants logged 2.8 kilometres of car or bus travel per day, compared to 3.4 kilometres the year before," said Victor Douglas Ngo, the study's first author and a researcher at the health and community design lab at UBC. "Less commuting also meant they generated 21 per cent less travel-related emissions, producing 520 grams of emissions a day, from 660 grams the previous year."

The group that lived more than 300 metres away did not show the same reductions in car or bus travel. Their motorized travel actually increased by 37 per cent to an average of 2.6 kilometres per day per person, from 1.9 kilometres previously. In addition, their average individual carbon emissions grew to 510 grams per day, from 330 grams previously.