{"id":34001,"date":"2016-06-10T12:35:00","date_gmt":"2016-06-10T12:35:00","guid":{"rendered":""},"modified":"2020-10-09T15:45:34","modified_gmt":"2020-10-09T15:45:34","slug":"9001-can-cement-clean-up-its-act","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/pollution\/9001-can-cement-clean-up-its-act\/","title":{"rendered":"Can cement clean up its act?"},"content":{"rendered":"

Cement is the most widely used substance on the planet after water. It is also one of the most polluting \u2013 producing between <\/span>5-8% of global greenhouse gas emissions<\/a>, more than twice than that attributed to aviation. Cement’s carbon footprint increases every year with huge demands for building materials, particularly in China, India and large parts of the developing world.<\/p>\n

In some ways, the global cement industry has been more receptive to the green agenda than some fossil fuel energy companies and large utilities. <\/span>Cement makers have signed up to voluntary emissions cuts, reassured they will play a key role producing the materials needed for a low carbon world \u2013 from building hydropower dams to fixing wind turbines.<\/p>\n

At the Paris climate summit<\/a> last year, Heidelberg Cement and 16 other cement manufacturers went further and promised to <\/span>decarbonise their production by 2030<\/a>. The effort, they claimed, will lead to a 10% worldwide reduction in carbon dioxide (CO2) emissions.<\/p>\n

But demand for cement is growing faster than emissions per tonne are falling, leading to an overall <\/span>increase in emissions<\/a>. What\u2019s more, two thirds of the sector\u2019s emissions come from the chemical reaction induced when cement ingredients are mixed in the kiln. This means the industry\u2019s environmental headache will only grow.<\/p>\n

\u201cWe are convinced we have to do something on CO2 emissions in a proactive way,\u201d said <\/span>Rob van der Meer, public affairs director on global environmental sustainability for Germany\u2019s giant Heidelberg Cement, one of the world’s largest producers.<\/p>\n

So far, Heidelberg has made cuts by boosting the energy efficiency of its operations, replacing coal with renewable alternatives such a biomass and waste material, and substituting a proportion of emissions-intensive clinker in cement with cleaner materials.<\/span><\/p>\n

But all these processes have their limitations. \u201cAll of this will result in 30% reductions in emissions by 2030 from 2005 levels \u2013 but this is not enough to limit to (a rise in global warming to) 2C,\u201d says van der Meer.<\/p>\n

A more radical solution is needed. Some scientists have proposed  ways to produce \u201ccarbon zero\u201d cement using binding agents derived from oil and silicon. California-based Calera Corp<\/a> has even found ways for cement production to absorb more carbon than it releases, similar to how certain corals produce reefs by excreting dissolved calcium carbonate or limestone.<\/p>\n

But none of these new technologies have achieved commercial success or been proven at scale.<\/span><\/p>\n

See also: China’s cement industry could crack as tougher environmental laws bite<\/a><\/strong><\/p>\n

The case for CCS<\/strong><\/p>\n

The industry has latched on to Carbon Capture and Storage (CCS)<\/a> technology as its insurance against future curbs on carbon. CCS is an umbrella term for a range of methods to suck carbon dioxide from the atmosphere at the point of source and store it underground. But some critics see the idea as a non-starter because it locks dirty fossil fuel power plants into future energy systems and deflects funding for renewable alternatives. However, advocates point out there is a big difference in using CCS for industrial processes, for which there are no alternatives so far.<\/p>\n

\u201cThere will be carbon capture<\/span>…We see it as a necessity for our sector, we cannot escape it,\u201d said van der Meer.<\/p>\n

It\u2019s not just the cement industry. Scientists and climate researchers are <\/span>warning<\/a> that the world can\u2019t meet the Paris targets and cap global warming at 2C without developing new technologies to suck carbon dioxide out of the air. The IEA views<\/a> the technology as the most cost effective way of delivering around a fifth of required global carbon reductions (based on a certain number of CCS plants being operational by 2050).<\/p>\n

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Source: IEA Cement Roadmap\u200b<\/a><\/em><\/p>\n

Industrial CCS is the cornerstone of the European Commission\u2019s<\/span> plans<\/a> to cut emissions 95% by 2030. It is also a key part of the UK\u2019s energy strategy to meet its own climate targets enshrined in law, given the country\u2019s dependence on oil and gas.<\/p>\n

However, the necessary funding and support has failed to emerge.\u201cIt\u2019s a desperate situation\u201d says Jonas Helseth, policy officer at Bellona, a Norwegian think tank:<\/span> \u201cLack of action on CCS is undermining the world\u2019s ability to counter climate change.\u201d<\/p>\n

Pilots<\/strong><\/span><\/p>\n

Heidelberg has thrown itself into CCS research and development, in collaboration with the European Cement Research Academy. In Norway, they have finished testing a carbon capture project at the major NORCEM cement factory<\/a> last year in Brevik, and are now waiting for the government to figure out a funding mechanism to develop a full scale demonstration project.<\/p>\n

The project will<\/span> capture 50% of emissions by extracting CO2 out of the cement plant\u2019s smokestack flue gas. If all goes to plan, the plant will become Norway\u2019s third operational CCS project by 2020, catching up to 400,000 tonnes of CO2, piping it for storage in an underwater continental shelf, or converted into low carbon biofuel<\/a> for transport.<\/p>\n

The Norwegian government has provided 75% of the \u20ac12 million (90 million yuan) investment, and Heidelberg hopes this will act as a blueprint for future production plants with carbon capture.  <\/span><\/p>\n

Another cement <\/a><\/span>pilot plant<\/a> is being developed by a consortium of companies at Lixhe in Belgium, funded by the European Commission<\/a>, as well as pilots in Texas<\/a>.<\/p>\n

Fits and starts<\/strong><\/span><\/p>\n

But despite the emergence of some projects, delays, rising costs and protests have plagued the development of CCS since the Norwegian energy giant Statoil proposed the concept more than two decades ago.<\/p>\n

Pilot projects have floundered across Europe. To the shock of investors, last year the UK government unexpectedly pulled \u00a31 billion (9.6 billion yuan) of funding from the White Rose CCS Commercialisation project, weeks before the final bid.  <\/span><\/p>\n

Without further government funding, the Norwegian project is out of the question, Heidelberg\u2019s van der Meer admits.<\/p>\n

Storage woes<\/strong><\/p>\n

The dilemma of where to put the captured carbon poses is similar to that of where to bury nuclear waste. The Brevik project has been plagued by protests<\/a> by locals worried about the disastrous consequences of stored CO2 escaping<\/a> even from a deep geological deposit.<\/p>\n

The plant, incidentally, was the scene of one of Norway\u2019s worst pollution accident in 2001 when at least 750 tonnes of toxic sludge poured into the local harbour and fjord waters. Local authorities have refused the use of the harbour and mine to store carbon because it is close to a large population of people.<\/p>\n

\u201cCCS is basically about taking a problem and stuffing it away under the <\/span>carpet,\u201d Rasmus Hansson, parliamentary leader of Norway\u2019s Green party has said in a recent interview with The Guardian<\/em>. \u201cWe will then live with the statistical risk of some gigantic underground burp.\u201d<\/p>\n

The immense costs of building CCS projects, and rock bottom<\/a> prices for carbon in the EU\u2019s dysfunctional Emissions Trading Scheme (ensuring the incentives for CCS are weak<\/a>), further threaten the future commercial viability of the technology.<\/p>\n

Leakage<\/strong><\/span><\/p>\n

Cement makers have more immediate concerns of their own. If competitors in Eastern Europe, Turkey and Asia flood the market with cheap cement, CCS becomes a less attractive option.<\/p>\n

\u201cIt will increase our costs by 50% and our competitors outside of Norway will come into the market with cheap cement,\u201d says van de Meer.<\/p>\n

The China question<\/strong><\/p>\n

If cement is going to clean up its act, a lot rides on what happens in China \u2013 where 60% of global cement is produced \u2013 at the moment mostly from old fashioned small plants with coal-fired, smoke-spewing furnaces.<\/p>\n

CCS <\/span>is a key part of China\u2019s national climate change programme<\/a> \u2013 but apart from investing in a cement pilot in Texas, the focus has been on curbing emissions from coal-fired power plants rather than cleaning up heavy industry.<\/p>\n\n\n