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Windmill blades before we process them. >> reporter: her company cuts them down to size and shreds them. >> this is our final product. >> reporter: cement makers use it as fuel, cutting carbon emissions at the cement plant by nearly 30%. if you weren't recycling this, >> what does happen unfortunately, a lot of those end up in landfills. >> reporter: most used windmill blades are buried in the ground because it's cheaper. a black eye for green energy. by 2050, the world's wind indusis expected to produce 47 million tons of blade waste each year. >> this is not suitable for reuse. >> reporter: ...

If the cement industry were a country, it would the third-biggest carbon polluter

Congress, there has been a massive push towards a greener economy. around the world, more than a trillion dollars was invested in renewable energy last year. but in tonight's "eye on america," cbs's ben tracy finds that going green comes at a cost. >> reporter: the blades on massive wind turbines can be as long as a football field, and strong as a linebacker. >> they are designed not to break, so when your job is to break them, obviously it's tough. >> reporter: julie angulo brought us to this quarry in louisiana, missouri. >> reporter: what is all of the stuff? >> this is our storage of windm...

While it is true that cement prices have not seen the anticipated recovery yet, the easing of cost inflation pressures offers respite and bodes well for the sector's operating performance

The problem is that at a time when many cement makers are going full throttle on capacity expansions, Heidelberg is lagging behind. The company will focus on increasing capacity only marginally via debottlenecking and the ongoing debottlenecking is slated to be completed by FY24