What advice is given regarding breathing during stretching?单项选择题
A
Hold your breath to increase muscle tension.
B
Avoid breathing too much during stretching to allow oxygen to flow to muscles.
C
Take quick, shallow breaths to maintain focus, and to aid in flow of oxygen to muscles.
D
Breathe deeply and rhythmically to reduce stress and relax the body.
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The amount of land needed to generate a kilowatt-hour from PV is comparable to that of coal power, when the land associated with mining coal is accounted for. What’s more, about half of the PV installations in our future scenario in 2050 could be placed on rooftops. Environmental effects from hydropower vary widely, we found. Some dams cause significant climate impacts through the emissions of methane from the decomposition of biomass in reservoirs. Other dams cause equally serious ecological problems through habitat destruction. They can also block the migration of aquatic species and reduce sediment flow and nutrient transport, which affects floodplains and deltas. On the other hand, reservoirs form new habitats for birds and other species. Hydropower offers a good example of the importance of site selection and project design. Some projects may be economically viable but ultimately should not be implemented due to the environmental degradation they can cause. 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