4 - 交通业
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15% is not much, but it varies a lot depending on the country and lifestyle. In Western countries, the share of transportation, especially air travel, can account for a significant part of people's carbon footprint. If you take one or more long haul flights a year, that's the bulk of your carbon footprint.
1Cause
accounts for 15% of GHG emissions
1Consequence
1Other possible cause
see 5=>1
2Other possible consequences
Local pollution due to exhausts pipes is one of the main motivations to promote electric cars, far more than climate change. But EV are responsible for CO2 emissions due to power generation. These emissions depend a lot on the country where the car is rolling. See the file about it.
Road construction sometimes requires deforestation, but the one-dimensional aspect of the road makes it almost negligible compared to deforestation linked to agriculture.