#4 Harvesting energy from America's working lands is more sustainable than drilling or mining fossil fuels. Drilling and transporting oil has many landscape and land use impacts. Drilling sites are often in sensitive environmental areas, pipelines divide habitat and ecosystems, and tankers and storage facilities raise the risk of spills that pollute coastlines and groundwater. In contrast, growing biofuels can increase wildlife habitat and be done sustainably by using native plant, existing crops, and agricultural and forest waste. Additionally. ethanol is biodegradable , eliminating the danger of spills and storage.
#5 Ayutthaya was geographically advantaged since it was located on a plain where three rivers-the Chao Phraya, the Pa Sak, and the Lopburi-joined. Ayutthaya was an island surrounded by tthese three rivers, protecting it from its enemies. Furtherore, there was a 12 kilometre wall enclosing the island. Situated on a plain, Ayutthaya was also suitable for cultivating rice and since it was not far from the sea, it was convenient for trade with foreign countries. Thus, Ayutthaya controlled both agriculture and trade by sea.