Which is the primary challenge in widespread use of biodiesel fuel?

cost

greenhouse gases

infrastructure

technology

waste products

What is the rationale for government provision of education? -not all incomes are equal, but everyone has the right to education regardless of wealth. -potential students consider only their personal benefits gained from education, but the rest of society benefits, too. -no education would be provided in the absence of government provision because everyone would consume it without paying. -the cost of providing education for the entire public is too large. -the government can provide education at a much lower cost than the private sector.

How do earth’s systems interact with each other?

What is the meaning of life and everything