1. INTERIOR:

Salazar's resignation spurs assessments of his tenure, talk about replacements

Interior Secretary Ken Salazar today said he will leave President Obama's Cabinet by the end of March to return to his family in Colorado, leaving a deep imprint on the management of the nation's lands and waters. His departure leaves another hole in Obama's Cabinet and could signal major changes at an agency that oversees energy development, conservation and wildlife protections on a fifth of the nation's land and the outer continental shelf. Go to story #1

1. INTERIOR:

Salazar's resignation spurs assessments of his tenure, talk about replacements

Top Stories

2. POLITICS:

Salazar still a hot commodity -- if he's interested

3. CLIMATE:

Fight over power plants has parallels to fuel-economy push in Obama's first term

4. BIOFUELS:

Energy companies buckle up in hope of green aviation takeoff

Politics

5. EPA:

Gregoire talks up green achievements in final speech as Wash. governor

6. ADVOCACY:

'Tough, unrelenting' attorney is remembered for Clean Water Act battles

7. DEFENSE:

Hagel's seat on Chevron board hasn't drawn criticism

Congress

8. NUCLEAR:

House Republicans to probe impact of NRC safety regs on industry

9. CLIMATE:

Carbon tax remains out of 'fiscal cliff' discussions

10. PUBLIC LANDS:

House Republican wants to rein in president's ability to designate monuments

Natural Resources

11. FISHERIES:

Research challenges key aspect of setting catch limits

12. OCEANS:

Chemicals in plastic threaten marine life -- study

13. OCEANS:

University rescues drowning NOAA lab

14. WILDLIFE:

Enviros demand answers after Army Corps levels Calif. preserve

15. ENDANGERED SPECIES:

Authorities find 2 tons of smuggled ivory in Kenya

16. WILDLIFE:

Russia plans 3-month wolf hunt in Siberia

Energy

17. HYDRAULIC FRACTURING:

EPA reversed well-contamination order after driller protested

18. OIL AND GAS:

Pipeline leak shuts down up to 27 U.K. oil fields

19. RENEWABLE ENERGY:

British crown pours $32M into wave, tidal projects

Federal Agencies

20. NATIONAL PARKS:

NPS spokesman announces retirement

21. EPA:

Agency IG lays out detailed goals and investigations for 2013

22. EPA:

Jackson pegs BP spill fines as career highlight

23. DOE:

Construction of Hanford waste-treatment plant continues

Transportation

24. HIGH-SPEED RAIL:

Proposed costs to be kept secret until bid for Calif. project selected

25. AUTOS:

Nissan expands function of DOE-funded battery plant

26. FUEL ECONOMY:

Ford warns of changes to hybrid mileage testing

27. AUTOS:

Despite slow sales, 2 major automakers push electric cars

Air and Water

28. TOXICS:

Air emissions dropped, but total chemical releases grew in 2011 -- EPA

29. WATER POLLUTION:

Tanker shifted direction at last minute before accident

30. AIR POLLUTION:

Hong Kong to offer subsidies in an effort to get rid of older vehicles

States

31. ALASKA:

Governor proposes overhaul of oil tax structure

32. MISSISSIPPI:

Commission fires marine resources director

E&ETV's OnPoint

33. CLIMATE:

World Resources' Steer discusses impact of financial constraints on green investment

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