When Baltimore County, Howard are represented, what's the first elected when the committee is environmental matters (vice-chair)?
CREATE TABLE "current_members_of_the_howard_county_del" (
  "district" text,
  "counties_represented" text,
  "delegate" text,
  "party" text,
  "first_elected" real,
  "committee" text
);
SELECT MAX("first_elected") FROM "current_members_of_the_howard_county_del" WHERE "counties_represented"='baltimore county, howard' AND "committee"='environmental matters (vice-chair)';