"Low-carbon life" starts from now, from me. According to estimates, 1 hectare of deciduous broad-leaved forest can absorb 14 tons of carbon dioxide per year. If the refrigeration temperature of each air conditioner is adjusted to 27°C on the basis of the 26°C advocated by the state, the corresponding annual reduction of carbon dioxide emissions is 21 kg. This emission reduction alone in a certain city is equivalent to the carbon dioxide absorbed by 18,000 hectares of deciduous broad-leaved forests throughout the year; if each family counts as two air conditioners, how many tens of thousands of households are there in the city?
"低碳生活"从现在做起，从我做起．据测算，1公顷落叶阔叶林每年可吸收二氧化炭14吨．如果每台空调制冷温度在国家提倡的26℃基础上调到27℃，相应每年减排二氧化碳21千克．某市仅此项减排就大约相当于18000公顷落叶阔叶林全年吸收的二氧化碳；若每个家庭按2台空调计，该市家庭约有多少万户？
<gadget id="calculator">2 * 21</gadget>
<output>42</output>

<gadget id="calculator">1_000 / 42 / 10_000</gadget>
<output>1/420 = around 0.002381</output>

<gadget id="calculator">18_000 * 14 * (1/420)</gadget>
<output>600</output>

<result>600</result>