Cramer's 'Mad Money' Recap for July 31

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"The markets will remain difficult to navigate," Jim Cramer told viewers of his "Mad Money" TV show Thursday.

He defended calling the bottom in the markets on last night's show. In making the call, he said he did not mean that all stocks had bottomed, but rather that the time is right to begin buying stocks as they go down.

Cramer then returned to a theme which he said investors should be celebrating 365 days a year, the wind and solar stocks. "Wind and solar stocks are transcending the weakness in oil," said Cramer, indicating that the strength in these sectors is genuine, and will continue even if oil hits his ultimate target of below $120 a barrel.

Cramer said he expects at least four more years of strength in the green stocks, and reiterated his buys on Owens Corning (OC), Trinity Industries (TRN), a stock which he owns for his charitable trust, Action Alerts PLUS, and Mastec (MTZ).

Owens Corning recently predicted its wind business will be growing in the high double-digits for at least the next decade. With up to 18 tons of fiberglass used to produce a single windmill, Cramer said Owens' composite fiberglass business should easily be able to achieve those targets.

Cramer called Trinity his favorite in the wind power business. The company's stock was up 6.7% today alone on the back of strong earnings, and Trinity more than doubled its wind tower backlog to almost $1.5 billion. With wind power only accounting for 10% of the company's revenues, Cramer said he expects wind to overtake Trinity's flagship railcar business in just a few short years.

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