求翻译：农村有3 050万户用上沼气，相当于少排放二氧化碳4 900多万吨。水电装机容量、核电在建规模、太阳能热水器集热面积和光伏发电容量均居世界第一位。通过近几年的艰苦努力，我们在节能减排方面取得了一定的成效，但是要实现到2020年单位国内生产总值二氧化碳排放比2005年下降40%～45%远期目标，任务还相当艰巨，而且在实践过程中还将面临许多困难和障碍。是什么意思？

3 0.5 million in rural areas to spend the biogas, equivalent to less emissions of more than 4900 tons of carbon dioxide. Installed capacity of hydropower, nuclear power construction scale solar water heating and photovoltaic power generation capacity ranking first in the world. In energy saving in r

There are 3 500,000 rural households use the biogas, which is equivalent to less carbon dioxide emissions 2 4 900 more than 10,000 tons. Installed capacity of hydropower, nuclear power, and solar energy to heat water heater set size and photovoltaic power generation capacity ranks first in the world

The countryside has 3 500,000 households to use the methane, is equal in the few emissions c

3 households use biogas in rural or less 4 tons of carbon dioxide emissions. Installed capacity of hydropower, nuclear power station under construction scale, solar water heater collector area and photovoltaic power capacity ranks the first in the world. Through painstaking efforts in recent years,