The world's land area is about 149 million square kilometers, and the arable land area is only about 14 million square kilometers, while the desertification area is 8 million square kilometers more than twice the arable land area. How many billion square kilometers is the desertified area in the world?
全世界陆地面积约为1.49亿平方千米，可耕地面积只有约0.14亿平方千米，而荒漠化面积比可耕地面积的2倍还多0.08亿平方千米．全世界荒漠化面积约有多少亿平方千米？
<gadget id="calculator">0.14 * 2</gadget>
<output>0.28</output>

<gadget id="calculator">0.28 + 0.08</gadget>
<output>0.36</output>

<result>0.36</result>