虽然我们还不能肯定地说这是由于人类燃烧矿物燃料引起的，但是不可否认，气候系统正在发生灾难性变化。
While it is still not possible to say with certainty that this is caused by human beings burning fossil fuels, it is undeniable that catastrophic changes are going on in the climate system.
我们可以创造怎样的农业系统而不是依赖于补贴的农药，肥料及矿物燃料呢？
How can we create agricultural systems that are not dependent on subsidies of pesticides, fertilizers, and fossil fuels?
由于矿物燃料供应量下降，我们供应农业生态系统能量能持续多久？
How long can we continue to supplement agroecosystems with energy derived from declining fossil fuel supplies?
其中液体产物具有便于运输、储存等优点，可替代燃料油用于发电、供暖系统以及可代替矿物油提炼某些重要的化学物质。
The liquid pyrolysis products are easy to store and transport, and can be used as alternative fuels for power generation and heating.
其中液体产物具有便于运输、储存等优点，可替代燃料油用于发电、供暖系统以及可代替矿物油提炼某些重要的化学物质。
The liquid pyrolysis products are easy to store and transport, and can be used as alternative fuels for power generation and heating.
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