<PAGE> PAGE 1
000 A000000 12/31/97
000 C000000 0000877232
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 A
001 A000000 GREEN CENTURY FUNDS
001 B000000 811-06351
001 C000000 6174820800
002 A000000 29 TEMPLE PLACE
002 B000000 BOSTON
002 C000000 MA
002 D010000 02111
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 Y
007 B000000 2
007 C010100 1
007 C010200 2
007 C020200 BALANCED FUND
007 C030200 N
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
007 C011100 11
007 C011200 12
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
010 A00AA01 GREEN CENTURY CAPITAL MANAGEMENT, INC.
010 B00AA01 801-39630
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02111
010 A00AA02 SUNSTONE FINANCIAL GROUP, INC.
010 C01AA02 MILWAUKEE
<PAGE> PAGE 2
010 C02AA02 WI
010 C03AA02 53202
011 A00AA01 SUNSTONE DISTRIBUTION SERVICES, LLC
011 B00AA01 8-42106
011 C01AA01 MILWAUKEE
011 C02AA01 WI
011 C03AA01 53202
018 00AA00 Y
019 A00AA00 N
019 B00AA00 0
020 A000001 MERRILL LYNCH, PIERCE, FENNER & SMITH
020 B000001 13-5674085
020 C000001 5
020 A000002 OPPENHEIMER & CO., INC.
020 B000002 13-2798343
020 C000002 2
020 A000003 FIRST BOSTON
020 B000003 13-5659485
020 C000003 2
020 A000004 DILLON READ & CO., INC.
020 B000004 13-1939216
020 C000004 1
020 A000005 COWEN & CO.
020 B000005 13-5616116
020 C000005 0
020 A000006 BEAR STEARNS & CO., INC.
020 B000006 13-3299429
020 C000006 0
020 A000007 INSTINET CORP.
020 B000007 13-3443395
020 C000007 0
020 A000008 GOLDMAN SACHS
020 B000008 13-5108880
020 C000008 0
020 A000009 GRUNTAL & CO.
020 B000009 13-3179859
020 C000009 0
020 C000010 0
021 000000 12
022 A000001 SALOMON BROTHERS
022 B000001 13-3082694
022 C000001 32186
022 D000001 0
022 A000002 DILLON, READ & CO.
022 B000002 13-1939216
022 C000002 625
022 D000002 658
022 A000003 GRUNTAL & CO.
022 B000003 13-3179859
022 C000003 762
022 D000003 70
<PAGE> PAGE 3
022 A000004 HERZOG, HEINE, GEDULD, INC.
022 B000004 13-1955436
022 C000004 410
022 D000004 313
022 A000005 PERSHING
022 B000005 13-2741729
022 C000005 456
022 D000005 264
022 A000006 ALEX BROWN & SONS, INC.
022 B000006 52-1319768
022 C000006 322
022 D000006 168
022 A000007 SBCI SWISSBANK CORP. INVESTMENT BANKING, INC.
022 C000007 222
022 D000007 196
022 A000008 KNIGHT SECURITIES LP
022 C000008 162
022 D000008 244
022 A000009 GOLDMAN SACHS & CO.
022 B000009 13-5108880
022 C000009 377
022 D000009 0
022 A000010 BEAR STEARNS & CO., INC.
022 B000010 13-3299429
022 C000010 186
022 D000010 137
023 C000000 38276
023 D000000 3986
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
029 00AA00 N
030 A00AA00 0
030 B00AA00 0.00
030 C00AA00 0.00
031 A00AA00 0
031 B00AA00 0
032 00AA00 0
033 00AA00 0
034 00AA00 N
035 00AA00 0
036 B00AA00 0
037 00AA00 N
038 00AA00 0
<PAGE> PAGE 4
039 00AA00 N
040 00AA00 Y
041 00AA00 Y
049 00AA00 N
050 00AA00 N
051 00AA00 N
052 00AA00 N
053 A00AA00 Y
053 B00AA00 Y
053 C00AA00 N
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 Y
054 D00AA00 Y
054 E00AA00 N
054 F00AA00 Y
054 G00AA00 Y
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 Y
054 L00AA00 Y
054 M00AA00 Y
054 N00AA00 Y
054 O00AA00 Y
058 A00AA00 N
059 00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061 00AA00 100
077 A000000 Y
077 B000000 N
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078 000000 N
086 A010000 0
<PAGE> PAGE 5
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
008 A000201 GREEN CENTURY CAPITAL MANAGEMENT, INC.
008 B000201 A
008 C000201 801-39630
008 D010201 BOSTON
008 D020201 MA
008 D030201 02111
008 A000202 WINSLOW MANAGEMENT COMPANY
008 B000202 S
008 C000202 801-159300
008 D010202 BOSTON
008 D020202 MA
008 D030202 02110
012 A000201 INVESTORS BANK & TRUST COMPANY
012 B000201 85-720
012 C010201 BOSTON
012 C020201 MA
012 C030201 02116
013 A000201 KPMG PEAT MARWICK LLP
013 B010201 BOSTON
013 B020201 MA
013 B030201 02110
015 A000201 INVESTORS BANK & TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02116
015 E010201 X
024 000200 N
025 D000201 0
025 D000202 0
025 D000203 0
025 D000204 0
025 D000205 0
025 D000206 0
025 D000207 0
025 D000208 0
028 A010200 270
028 A020200 0
028 A030200 0
028 A040200 81
<PAGE> PAGE 6
028 B010200 262
028 B020200 0
028 B030200 0
028 B040200 93
028 C010200 237
028 C020200 0
028 C030200 0
028 C040200 50
028 D010200 266
028 D020200 0
028 D030200 0
028 D040200 29
028 E010200 174
028 E020200 0
028 E030200 0
028 E040200 53
028 F010200 392
028 F020200 1022
028 F030200 0
028 F040200 42
028 G010200 1601
028 G020200 1022
028 G030200 0
028 G040200 348
028 H000200 0
042 A000200 100
042 B000200 0
042 C000200 0
042 D000200 0
042 E000200 0
042 F000200 0
042 G000200 0
042 H000200 0
043 000200 16
044 000200 10
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.750
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
<PAGE> PAGE 7
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
055 A000200 Y
055 B000200 N
056 000200 Y
057 000200 N
062 A000200 N
062 B000200 0.0
062 C000200 0.0
062 D000200 0.0
062 E000200 0.0
062 F000200 0.0
062 G000200 0.0
062 H000200 0.0
062 I000200 0.0
062 J000200 0.0
062 K000200 0.0
062 L000200 0.0
062 M000200 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 0.0
063 A000200 0
063 B000200 0.0
066 A000200 N
067 000200 Y
068 A000200 N
068 B000200 N
069 000200 N
070 A010200 Y
070 A020200 Y
070 B010200 Y
070 B020200 Y
070 C010200 Y
070 C020200 N
070 D010200 Y
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 Y
070 F020200 N
<PAGE> PAGE 8
070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 Y
070 K010200 N
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 N
070 O020200 N
070 P010200 N
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200 7967
071 B000200 7012
071 C000200 12003
071 D000200 58
072 A000200 6
072 B000200 153
072 C000200 24
072 D000200 0
072 E000200 0
072 F000200 47
072 G000200 94
072 H000200 0
072 I000200 0
072 J000200 0
072 K000200 0
072 L000200 0
072 M000200 0
072 N000200 0
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 0
072 S000200 0
072 T000200 16
072 U000200 0
072 V000200 0
072 W000200 0
<PAGE> PAGE 9
072 X000200 157
072 Y000200 0
072 Z000200 20
072AA000200 1412
072BB000200 253
072CC010200 52
072CC020200 0
072DD010200 78
072DD020200 0
072EE000200 1205
073 A010200 0.0880
073 A020200 0.0000
073 B000200 1.3508
073 C000200 0.0000
074 A000200 0
074 B000200 486
074 C000200 0
074 D000200 3283
074 E000200 0
074 F000200 9627
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 0
074 K000200 0
074 L000200 97
074 M000200 0
074 N000200 13493
074 O000200 46
074 P000200 27
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 174
074 S000200 0
074 T000200 13246
074 U010200 980
074 U020200 0
074 V010200 13.52
074 V020200 0.00
074 W000200 0.0000
074 X000200 1009
074 Y000200 0
075 A000200 0
075 B000200 12375
076 000200 0.00
080 C000200 0
081 B000200 0
082 B000200 0
083 B000200 0
<PAGE> PAGE 10
084 B000200 0
SIGNATURE MEG GREIFENKAMP
TITLE ADMINISTRATOR
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000877232
<NAME> GREEN CENTURY FUNDS
<SERIES>
<NUMBER> 2
<NAME> BALANCED FUND
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> JUN-30-1998
<PERIOD-END> DEC-31-1997
<INVESTMENTS-AT-COST> 12,079,459
<INVESTMENTS-AT-VALUE> 13,396,516
<RECEIVABLES> 96,783
<ASSETS-OTHER> 0
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 13,493,299
<PAYABLE-FOR-SECURITIES> 45,625
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 202,140
<TOTAL-LIABILITIES> 247,765
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11,411,090
<SHARES-COMMON-STOCK> 979,849
<SHARES-COMMON-PRIOR> 814,559
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 5,195
<ACCUMULATED-NET-GAINS> 511,748
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1,327,891
<NET-ASSETS> 13,245,534
<DIVIDEND-INCOME> 23,685
<INTEREST-INCOME> 152,657
<OTHER-INCOME> 0
<EXPENSES-NET> (156,474)
<NET-INVESTMENT-INCOME> 19,868
<REALIZED-GAINS-CURRENT> 1,158,925
<APPREC-INCREASE-CURRENT> 52,257
<NET-CHANGE-FROM-OPS> 1,231,050
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (78,490)
<DISTRIBUTIONS-OF-GAINS> (1,204,821)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 111,523
<NUMBER-OF-SHARES-REDEEMED> 24,380
<SHARES-REINVESTED> 78,147
<NET-CHANGE-IN-ASSETS> 2,223,392
<ACCUMULATED-NII-PRIOR> 53,427
<ACCUMULATED-GAINS-PRIOR> 557,644
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 46,942
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 156,474
<AVERAGE-NET-ASSETS> 12,428,323
<PER-SHARE-NAV-BEGIN> 13.53
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 1.41
<PER-SHARE-DIVIDEND> (0.09)
<PER-SHARE-DISTRIBUTIONS> (1.35)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 13.52
<EXPENSE-RATIO> 2.50
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
