The average car purchased in 2023 emits higher levels of carbon dioxide (CO₂) than its 2013 equivalent. This is due to the large proportion of SUVs in the mix, which tend to be bigger and heavier.
Especially since they aren't even light any more. Compare a Ford Ranger from the 1990s or early 2000s to the current generation and it looks like a toy. The current generation of light trucks and SUVs are bigger than full sized trucks and SUVs from 20 years ago.
The "light truck" segment is in comparison to the big semis or tractor trailers, which are medium or heavy duty trucks, and often require a commercial driver's license to operate.
For example, the typical school bus or fire truck is classified as a medium duty truck.
Heavy duty trucks generally include things like cement mixers or dump trucks.
The light truck category is incredibly broad (everything from zero to 14,000 lbs. My point is that the current crop of light trucks are verging closer to the top of that category than they historically had been even within that category apart from its increasing presence in the mix of consumer cars.