Earth & Environmental Sciences
trucking
100%
environmental regulation
75%
industry
39%
diesel engine
29%
profitability
29%
environmental protection agency
25%
gas engine
20%
exhaust gas
15%
environmental sustainability
14%
cost
13%
targeting
12%
diesel
12%
engine
12%
particulate matter
11%
sulfur
9%
regulation
9%
effect
3%
Business & Economics
Trucking
85%
Environmental Regulation
66%
Diesel Engine
37%
Environmental Protection Agency
34%
Profitability
33%
Exhaust Gas Recirculation
27%
Industry
23%
Operating Ratios
21%
Particulate Matter
19%
Oversight
13%
Environmental Sustainability
13%
Targeting
11%
Financial Performance
10%
Costs
10%
Engineering & Materials Science
Environmental regulations
85%
Environmental Protection Agency
35%
Industry
28%
Profitability
23%
Diesel engines
22%
Selective catalytic reduction
17%
Engines
16%
Exhaust gas recirculation
16%
Sulfur
12%
Sustainable development
11%
Costs
9%
Social Sciences
Environmental regulations
78%
industry
38%
profitability
30%
Environmental protection agencies
28%
evidence
27%
financial performance
18%
costs
14%
sustainability
9%
efficiency
9%
regulation
7%