Meanwhile members of the House Projection Forces Subcommittee had been pressing the Navy to use nuclear power for major combatants, partly as a response to concerns about the price and availability of oil.

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Most cast bullets are made of lead alloyed with tin and antimony; but zinc alloys have been used when lead is scarce, and may be used again in response to concerns about lead toxicity.

Also, the Embassy of the United States in Manila warned US citizens in the Philippines "to refrain from using Philippine-based carriers due to 'serious concerns' about the ATO's alleged mishandling of the aviation industry."

Some parents think board members are using the safety issue to mask political and personal concerns with the project.

It is used in the popular media and by environmentalists with reference to concerns about rapid global warming.