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Is the global economy finally gaining some momentum? Jim Cramer told his Mad Money viewers Tuesday that if the earnings from Alcoa (AA) - Get Alcoa Corp. Report are any indication, low interest rates might be spurring some actual growth.

Indeed, Alcoa has a lot of positive things to say, Cramer continued, enough to send shares up 5.4%, as aluminum is becoming the go-to metal for more and more auto and aerospace components. The company was also bullish on its prospects in Europe and China.

Then there are the mining and materials stocks including Freeport-McMoRan (FCX) - Get Freeport-McMoRan, Inc. (FCX) Report and Cliffs Natural Resources (CLF) - Get Cleveland-Cliffs Inc Report , which appear to be gaining steam, along with Caterpillar (CAT) - Get Caterpillar Inc. Report , up 2.5% today.

Cramer also noted the airlines roared today, with United Continental (UAL) - Get United Airlines Holdings, Inc. Report up 8.8% and American Airlines (AAL) - Get American Airlines Group, Inc. Report gaining over 11%.

All of these are a sign that continued low interest rates might actually be working, with China and Europe finally seeing some decent growth, Cramer concluded.

Off the Charts

In the "Off the Charts" segment, Cramer checked in with colleague Bob Lang over the charts of the semiconductor stocks, an explosive growth that can turbocharge the rest of the market.

Lang looked first at the daily chart of the Vaneck Vectors Semiconductor ETF (SMH) - Get VanEck Vectors Semiconductor ETF Report , noting that after the group's downturn in April it held its 200-day moving average and since June has broken out to the upside.

Turning to individual names, Lang liked Intel (INTC) - Get Intel Corporation (INTC) Report , which has made a solid move in recent weeks on strong volume. The MACD momentum indicator and the Chaikin Money Flow, or CMF, were also positive.

Lang next looked at NXP Semiconductors (NXPI) - Get NXP Semiconductors NV Report  , an Action Alerts PLUS holding. After completing an awful head-and-shoulders pattern, Lang felt the selling was now done and the relative strength indicator, or RSI, along with the MACD confirmed a bullish move if the stock can break above $82.

Still other positives in the semi space included Skyworks Solutions (SWKS) - Get Skyworks Solutions, Inc. Report , which just completed a "W" bottoming pattern with a strong CMF. He also liked Qualcom (QCOM) - Get QUALCOMM Incorporated Report , but Cramer said he prefers Intel.

Year in Review

Continuing with his "Half Year in Review" look at the first half of 2016, Cramer reviewed the performance of the consumer staples, materials and industrial sectors, three sectors he called the "best of the rest," after covering the utilities, telcos and energy sectors on last night's show.

The consumer staples enjoyed a similar rally to the utilities and telcos, Cramer said, as investors fled to safety stocks in search of yield. Hershey (HSY) - Get Hershey Company (HSY) Report topped the gainers at 27%, with Campbell Soup (CBP) and Tyson Food (TSN) - Get Tyson Foods, Inc. Class A Report not far behind at 26% and 25%.

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In the materials sector, Cramer noted those companies with underlying commodities that were on the rise did well, with Newmont Mining (NEM) - Get Newmont Goldcorp Corporation (NEM) Report doubling, up 117% for the half, and Freeport-McMoRan up 64%. Cramer told viewers to just buy Alcoa if they're interested in a materials stock.

Finally, there were the industrials, where machinery stocks were strong and airlines were among the weakest. Tyco (TYC) led the group, up 33% on a takeover bid, but others such as engine maker Cummins (CMI) - Get Cummins Inc. Report gained 27% even without a takeover.

Executive Decision: James Torgerson

For his "Executive Decision" segment, Cramer sat down with James Torgerson, CEO of the unconventional utility, Avangrid (AGR) - Get Avangrid, Inc. Report , our nation's largest renewable wind power generator.

Torgerson said that wind power is price competitive with other forms of power generation. The only challenge is storing power for when the wind doesn't blow. Avangrid currently produces 5,700 megawatts of power and is building another 1,500 megawatts to meet its existing purchase power agreements.

Torgerson said Avangrid uses turbines from General Electric (GE) - Get General Electric Company (GE) Report and others and is able to control all of their turbines nationwide from a single location. The company currently operates in New York, Texas, California and in the Midwest.

Cramer said that for younger investors who appreciate sustainability, Avangrid is an exciting story.

Lightning Round

In the Lightning Round, Cramer was bullish on Tractor Supply (TSCO) - Get Tractor Supply Company Report , Cambrex (CBM) - Get Cambrex Corporation Report , Vail Resorts (MTN) - Get Vail Resorts, Inc. Report , Apple Hospitality REIT (APLE) - Get Apple Hospitality REIT Inc Report , General Dynamics (GD) - Get General Dynamics Corporation (GD) Report , Lockheed Martin (LMT) - Get Lockheed Martin Corporation (LMT) Report , Northrop Grumman (NOC) - Get Northrop Grumman Corporation Report and Caterpillar (CAT) - Get Caterpillar Inc. Report .

No Huddle Offense

In his "No Huddle Offense" segment, Cramer told viewers they'd better think young because the times are changing, and being old can disqualify you from making money.

That's the only way Cramer said he could explain how the Pokemon Go craze could translate into real profits for Nintendo, or how a slew of other apps that Millennials can't live without spur hot stocks like Twilio (TWLO) - Get Twilio, Inc. Class A Report , which recently came public.

Paying attention to up and coming trends like augmented reality, which is at the heart of Pokemon Go, is important for your portfolio, Cramer concluded. So investors better do their homework, or at least ask their kids.

To watch replays of Cramer's video segments, visit the Mad Money page on CNBC.

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At the time of publication, Cramer's Action Alerts PLUS had a position in GE, LMT and NXPI.