As San Diego and Los Angeles have grown, the scrub land of southern California has been paved and built over. That has squeezed out the Quino checkerspot butterfly's habitat, and with the climate changes coming as a result of human greenhouse gas emissions, its listing as an endangered species by the U.S. government may not be enough to save the pretty little butterfly from extinction.
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% C6 _7 U$ q6 f2 kBut a group of biologists suggest in this week's Science that simply moving the butterfly into similar habitat in nearby mountain ranges might solve the problem by overcoming the unnatural barriers humans have erected in the path of any potential shift in its natural range to follow such changing conditions. They call the idea "assisted colonization."
' s+ h" Z, e$ s' F3 ]8 V. V) A红色和蓝色字体部分是怎么理解啊，主要是红色部分！
大概解释一下就行了，不需要逐字翻译。
