This 12 Valve mode results in swirl of the intake charge which increases combustion efficiency, resulting in improved low end torque and better fuel economy. (en.m.wikipedia.org)
The resulting reduced surface area of the direct injection diesel engine reduces heat losses, and thereby increases engine efficiency, at the expense of slightly increased combustion noise. (en.wikipedia.org)
This rapid rate of change — often referred to as human - caused climate change — has resulted from changes in atmospheric chemistry, specifically increases in greenhouse gases due to increased combustion of fossil fuels, land - use change (e.g., deforestation), and fertilizer production (Figure 2 - 1)(Forster et al. 2007). (montanaclimate.org)