UNION CARBIDE CORP /NEW/ filed this Form 10-K on 02/15/2018
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Climate Change
Climate change matters for UCC are driven by changes in regulatory matters and physical climate parameters.

Regulatory Matters
Regulatory matters include cap and trade schemes, increased greenhouse gas ("GHG") limits, and taxes on GHG emissions, fuel and energy. The potential implications of each of these matters are all very similar, including increased cost of purchased energy, additional capital costs for installation or modification of GHG emitting equipment, and additional costs associated directly with GHG emissions (such as cap and trade systems or carbon taxes), which are primarily related to energy use. It is difficult to estimate the potential impact of these regulatory matters on energy prices.

Reducing UCC's overall energy usage and GHG emissions through new and unfolding projects will decrease the potential impact of these regulatory matters. The Corporation has not experienced any material impact related to regulated GHG emissions.

Physical Climate Parameters
Many scientific academies throughout the world have concluded that it is very likely that human activities are contributing to global warming. At this point, it is difficult to predict and assess the probability and opportunity of a global warming trend on UCC specifically. Preparedness plans are developed that detail actions needed in the event of severe weather. These measures have historically been in place and these activities and associated costs are driven by normal operational preparedness. UCC continues to study the long-term implications of changing climate parameters or water availability, plant siting issues, and impacts and opportunities for products.

The Corporation continues to elevate its internal focus and external positions to focus on the root cause of GHG emissions, including the sustainable use of energy. Through corporate energy efficiency programs and focused GHG management efforts, the Corporation has and is continuing to reduce its GHG emissions footprint.

Environmental Remediation
UCC accrues the costs of remediation of its facilities and formerly owned facilities based on current law and existing technologies. The nature of such remediation includes, for example, the management of soil and groundwater contamination. The policies adopted to properly reflect the monetary impacts of environmental matters are discussed in Note 1 to the Consolidated Financial Statements. To assess the impact on the consolidated financial statements, environmental experts review currently available facts to evaluate the probability and scope of potential liabilities. Inherent uncertainties exist in such evaluations primarily due to unknown environmental conditions, changing governmental regulations and legal standards regarding liability, and emerging remediation technologies. These liabilities are adjusted periodically as remediation efforts progress or as additional technical or legal information becomes available. In the fourth quarter of 2016, the Corporation recorded an adjustment to the environmental accrual, primarily resulting from the culmination of negotiations with regulators and/or final stages of certain remediation projects. These charges were included in "Cost of sales" in the consolidated statements of income. The Corporation had an accrued liability of $95 million at December 31, 2017 and $125 million at December 31, 2016, related to the remediation of current or former UCC-owned sites.

In addition to current and former UCC-owned sites, under the Federal Comprehensive Environmental Response, Compensation and Liability Act and equivalent state laws (hereafter referred to collectively as "Superfund Law"), UCC is liable for remediation of other hazardous waste sites where UCC allegedly disposed of, or arranged for the treatment or disposal of, hazardous substances. Because Superfund Law imposes joint and several liability upon each party at a site, UCC has evaluated its potential liability in light of the number of other companies that also have been named potentially responsible parties ("PRPs") at each site, the estimated apportionment of costs among all PRPs, and the financial ability and commitment of each to pay its expected share. Management's estimate of the Corporation's remaining liability for the remediation of Superfund sites was $19 million at December 31, 2017 and $20 million at December 31, 2016, which has been accrued, although the ultimate cost with respect to these sites could exceed that amount. The Corporation has not recorded any third-party recovery related to these sites as a receivable.