SodaStream (NASDAQ: SODA) recently announced surprisingly strong first-quarter earnings as sales growth sped up to a 25% pace and profitability improved. The seller of at-home carbonated beverage machines is benefiting from a long-term trend of rising global demand for sparkling water.CEO Daniel Birnbaum and his executive team were happy with the results, but they have more aggressive plans in place aimed at building on the positive operating momentum.