2) Richie's house isn't as comfortable as George and Marlene's. George and Marlene's house is more comfortable than Richie's.
3) Detroit isn't as sunny as Cancun. Cancun is sunnier than Detroit.
4) Marlene's house isn't as interesting as Richie's island. Richie's island is more interesting than Marlene's house.
5) Cancun isn't as noisy as Detroit. Detroit is noisier than Cancun.
6) Villages aren't as polluted as big cities. Big cities are more polluted than villages.