<prompt> Translate the following text to EnglishKulingana na ripoti ya EPA, Kikundi cha Ushauri wa Uchumi wa Mazingira EEAC cha SAB kimependekeza kurekebisha WTP kwa ongezeko la mapato halisi kwa muda, lakini sio kurekebisha WTP kwa sababu ya tofauti za mapato ya msalaba kwa sababu ya unyeti wa kufanya tofauti kama hizo, na kwa sababu ya ushahidi usio wa kutosha unaopatikana kwa sasa EPA-SAB-EEAC-0013.  <response>: 21 Note that the Environmental Economics Advisory Committee EEAC of the SAB advised EPA to adjust WTP for increases in real income over time, but not to adjust WTP to account for cross-sectional income differences because of the sensitivity of making such distinctions, and because of insufficient evidence available at present EPA-SAB-EEAC-00-013. 